Japanese 'To': The Inevitable If
～と for machine-like logic where result B automatically and inevitably follows action A.
Grammar Rule in 30 Seconds
Use 'To' to describe natural, automatic consequences or facts that happen whenever a condition is met.
- Use with dictionary form verbs: {押す|おす}と動く (If you press it, it moves).
- Use with i-adjectives: {暑い|あつい}と眠くなる (If it's hot, I get sleepy).
- Use with nouns/na-adjectives: {雨|あめ}だと中止です (If it's rain, it's cancelled).
Overview
Japanese と (to) functions as a conditional particle signaling an inevitable, automatic, or natural consequence. Unlike the English "if," which often implies a hypothetical or uncertain situation, と establishes a relationship where the occurrence of event A always or naturally leads to event B. This makes と unsuitable for expressing personal will, requests, commands, or suggestions in the consequent clause, as these are inherently subjective and not inevitable outcomes.
You can think of と as describing a universal law, a fixed routine, a machine's operation, or an established fact. When you encounter と, consider the phrase "whenever A happens, B inevitably follows." It describes a cause-and-effect link that is objective and predictable, independent of the speaker's desires or intentions.
Its usage at the B1 level involves understanding this core inevitability and discerning when a situation genuinely demands such a strong, objective conditional. Mastering と means recognizing contexts where a result is a direct, undeniable outcome of a preceding action or state, rather than a desired or speculative possibility. For example, 水を温ると湯気が出る (Mizu o atatameru to yuge ga deru) – "When you heat water, steam comes out." This is a physical, undeniable truth.
Contrast this with a personal decision: you wouldn't say 疲れると、休みたい (Tsukareru to, yasumitai) – "If I get tired, I want to rest," because wanting to rest is a personal desire, not an inevitable consequence of being tired. You might want to push through or have other obligations.
How This Grammar Works
と serves as a conjunction, connecting an antecedent clause (the condition) with a subsequent clause (the inevitable result). The structure is consistently [Condition A] と [Result B]. The key linguistic principle at play is consequentialism through temporal and logical immediacy.ボタンを押すと、機械が動く (Botan o osu to, kikai ga ugoku) – "When you press the button, the machine moves," the movement of the machine is a direct, immediate, and expected result.と cannot be paired with volitional expressions—commands, requests, suggestions, personal desires, or intentions. These expressions reflect the speaker's subjective will, which, by definition, is not an inevitable outcome of a preceding condition. If you say 電気を消すと、暗くなる (Denki o kesu to, kuraku naru) – "When you turn off the light, it gets dark," the darkness is a physical, inevitable consequence.電気を消すと、寝よう (Denki o kesu to, neyou) – "Turn off the light and let's sleep," it sounds incorrect in Japanese because "let's sleep" implies a personal decision, not an automatic reaction.と often carries a nuance of discovery or realization when used with a past tense consequence. In this context, と doesn't imply that the speaker intended to find something, but rather that upon completing the action in the first clause, the situation in the second clause was revealed as an inevitable fact of that moment. For example, 窓を開けると、雪が降っていた (Mado o akeru to, yuki ga futte ita) – "When I opened the window, I found it was snowing." The act of opening the window inevitably led to the observation of snow, making と an apt choice to describe this factual discovery.と. This plain-form requirement further underscores と's objective nature, as plain forms typically describe facts, states, or actions without directly expressing politeness or subjective intent.Formation Pattern
と is straightforward, primarily requiring the plain (dictionary) form of the preceding word. The pattern applies consistently across verbs, i-adjectives, na-adjectives, and nouns. For nouns and na-adjectives, the copula だ (da) must precede と. This だ reflects the plain form of the copula.
と | Negative Plain Form + と | Example & Meaning |
と | ない Form + と | 行くと (iku to) - "when/if you go" 食べないと (tabenai to) - "when/if you don't eat" |
い Form + と | くない Form + と | 高いと (takai to) - "when/if it's expensive" 寒くないと (samukunai to) - "when/if it's not cold" |
だ + と | Stem + じゃない + と | 静かだと (shizuka da to) - "when/if it's quiet" 簡単じゃないと (kantan janai to) - "when/if it's not easy" |
だ + と | Noun + じゃない + と | 雨だと (ame da to) - "when/if it rains" 学生じゃないと (gakusei janai to) - "when/if you are not a student" |
です (desu) or ます (masu) forms do not typically appear directly before と. The conditional clause must remain in its plain, objective form. For instance, you would say ボタンを押すと、機械が動きます (Botan o osu to, kikai ga ugokimasu) – "When you press the button, the machine moves." Here, politeness is conveyed at the end of the sentence, not within the と clause.
When To Use It
と is reserved for situations where the result is a certain, objective, and predictable outcome of the condition. Its core utility lies in describing relationships that are absolute, habitual, or purely factual. Understanding these categories is crucial for accurate application, as と functions as an almost scientific statement of cause and effect.- Natural Laws and Universal Truths: Use
とto express scientific principles, natural phenomena, or universally acknowledged facts where cause inevitably leads to effect. These are conditions that hold true for everyone, everywhere, reflecting an unchanging reality. 水は０度になると凍る。(Mizu wa reido ni naru to kooru.) – "When water reaches 0 degrees, it freezes." (An undeniable scientific fact.)春になると、桜が咲く。(Haru ni naru to, sakura ga saku.) – "When spring comes, the cherry blossoms bloom." (A predictable annual occurrence in nature.)
- Habitual Actions and Routines:
とis ideal for describing repeated actions or states that consistently lead to the same result. This reflects a personal routine, a common tendency, or an established pattern. The consequence is not a choice, but a consistent, almost automatic reaction to the condition. 私は疲れていると、甘いものが食べたくなる。(Watashi wa tsukareteiru to, amai mono ga tabetakunaru.) – "Whenever I'm tired, I feel like eating something sweet." (A consistent personal tendency.)彼は暇だと、いつもゲームをする。(Kare wa hima da to, itsumo geemu o suru.) – "Whenever he has free time, he always plays games." (His established routine; the behavior is automatic.)
- Instructions, Directions, and Machine Operations: When providing precise guidance, explaining how a device works, or describing a sequence of operations,
とindicates an unfailing result. These are conditions that, if met, will always produce a specific, expected outcome, free from human variability. このボタンを押すと、ドアが開きます。(Kono botan o osu to, doa ga akimasu.) – "When you press this button, the door opens." (A machine's predictable function.)次の信号を右に曲がると、駅があります。(Tsugi no shingou o migi ni magaru to, eki ga arimasu.) – "When you turn right at the next traffic light, there's a station." (Giving directions where the landmark's presence is an objective fact.)
- Unexpected Discoveries or Realizations (Past Tense Consequence): This is a crucial and often surprising usage for learners.
とcan express a discovery made immediately after performing an action. Here,とhighlights that the subsequent event was observed as an inevitable fact at that moment, even if it was unanticipated by the speaker. The result clause often describes a state or a fact that was revealed, not an intended outcome. It signifies the direct, objective observation that occurred upon the completion of the first action. 窓を開けると、雪が降っていた。(Mado o akeru to, yuki ga futte ita.) – "When I opened the window, I found it was snowing." (The snow was an immediate, factual observation.)部屋に入ると、誰もいなかった。(Heya ni hairu to, dare mo inakatta.) – "When I entered the room, no one was there." (The emptiness was an immediate, objective fact upon entering.)
When Not To Use It
と is inappropriate is as vital as knowing when to use it, especially at the B1 level where distinctions between conditionals can be subtle. The fundamental reason to avoid と is whenever the consequent action or state is not an automatic, objective, and inevitable outcome of the condition, or when it involves the speaker's direct will or desire. If there's any element of choice, intention, request, or command, と is the wrong choice.- Volitional Expressions: This is the most significant restriction and the source of many learner errors.
とcannot be followed by verbs or phrases that express personal will, requests, commands, suggestions, intentions, desires, or prohibitions. These are subjective human choices, not inevitable, machine-like reactions to a condition. - Commands/Requests: You cannot use
とto order someone to do something. For example,～なさい(-nasai),～てください(-te kudasai). - ❌
雨が降ると、傘を持って行きなさい。(Ame ga furu to, kasa o motte ikinasai.) – "If it rains, take an umbrella." (Incorrect: "take an umbrella" is a command.) - ✅
雨が降ったら、傘を持って行きなさい。(Ame ga futtara, kasa o motte ikinasai.) – (Correct:たらaccommodates volitional endings.) - Suggestions/Invitations: You cannot use
とto suggest something. For example,～ましょう(-mashou),～ませんか(-masen ka),～よう(-you). - ❌
時間があると、映画を見よう。(Jikan ga aru to, eiga o miyou.) – "If we have time, let's watch a movie." (Incorrect: "let's watch" is a suggestion.) - ✅
時間があったら、映画を見よう。(Jikan ga attara, eiga o miyou.) – (Correct:たらis appropriate here.) - Desires/Intentions: Expressions of what you want to do or intend to do are personal choices. For example,
～たい(-tai),～つもりだ(-tsumori da). - ❌
{お金|かね}があると、新しい車を買いたい。(Okane ga aru to, atarashii kuruma o kaitai.) – "If I had money, I want to buy a new car." (Incorrect: "want to buy" expresses desire.) - ✅
{お金|かね}があったら、新しい車を買いたい。(Okane ga attara, atarashii kuruma o kaitai.) – (Correct.) - Permissions/Prohibitions: These involve subjective judgment, rules, or authority, not automatic physical consequences. For example,
～てはいけない(-te wa ikenai),～てもいい(-temo ii). - ❌
遅刻すると、入ってはいけない。(Chikoku suru to, haitte wa ikenai.) – "If you're late, you can't enter." (Incorrect: "can't enter" is a prohibition.) - ✅
遅刻したら、入ってはいけない。(Chikoku shitara, haitte wa ikenai.) – (Correct.)
- Hypothetical or Unlikely Conditions with Subjective Outcomes: If both the condition and the outcome are speculative or highly contingent on personal choice,
とis generally unsuitable. For instance, winning the lottery is highly hypothetical, and buying a car with the winnings is a personal choice.とwould be inappropriate for such a scenario. You would useたらorばfor these.
- Single, Non-Habitual Events Leading to a Specific Action: For a one-time event where the subsequent action is a deliberate choice rather than an automatic physical reaction, other conditionals like
たらare usually preferred. Whileとcan describe a "discovery" in a past context, it's about the unveiling of a fact, not a planned action following an event.
と is likely the wrong choice. The fundamental constraint is the objectivity and inevitability of the consequence.Common Mistakes
と due to its superficial resemblance to "if" in English. Avoiding these common pitfalls is key to mastering its use, especially by understanding the why behind the restrictions.- Using
とwith Volitional Endings: This is, by far, the most pervasive error. Japanese learners often translate English "if... then I will/let's/should" directly, overlookingと's strict requirement for objective, inevitable consequences. Remember thatとcan never be followed by expressions of will, intent, desire, or command. The reason is that personal will is inherently subjective and not an automatic outcome. - Incorrect:
明日、雨が降ると、家に居よう。(Ashita, ame ga furu to, ie ni iyou.) – "If it rains tomorrow, let's stay home." - Correct:
明日、雨が降ったら、家に居よう。(Ashita, ame ga futtara, ie ni iyou.) – (たらaccommodates the volitional 'let's stay home' because it focuses on the completion of the condition.)
- Omitting
だfor Nouns and Na-Adjectives: Another frequent mistake is forgetting to insertだbeforeとwhen the conditional clause ends with a noun or a na-adjective. This is a fundamental conjugation rule that applies to all plain-form uses of these word types. Theだis the plain form of the copulaです(desu) and is essential for forming a grammatically correct plain-form clause. - Incorrect:
学生と、割引があります。(Gakusei to, waribiki ga arimasu.) – "If you are a student, there is a discount." - Correct:
学生だと、割引があります。(Gakusei da to, waribiki ga arimasu.) – (Theだis essential to properly connect the noun学生toと.)
- Overlaps and Misinterpretation with
たら: Whileとandたらcan sometimes be interchangeable (especially for natural phenomena or discoveries that are purely factual), learners often struggle with their distinct nuances. The core difference is thatたらemphasizes the completion of the prior action before the subsequent event, and it can be followed by volitional expressions.と, however, focuses on the inevitable consequence and cannot be volitional. When in doubt about whether to use a volitional ending,たらis generally the safer and more flexible choice for B1 learners. と: Objective, inevitable, no volition. The sequence is often perceived as instantaneous or directly causal. It states a general truth.たら: Completion of action (～たら). Can be followed by volition. More flexible for one-off events or conditions that precede a decision. It sets up a condition that once met, leads to the next event or action.
- Using
とfor Strong Advice/Warning: Whileとcan describe objective negative consequences (e.g.,勉強しないと落ちる– "If you don't study, you'll fail"), it doesn't inherently carry a strong warning or "if you don't do X, then Y bad thing will happen" nuance as strongly as other negative conditional forms like～ないと(-nai to) (often a shortened form of～ないといけない(-nai to ikenai) implying necessity) or～なければならない(-nakereba naranai). The nuance ofとis purely observational: this is what happens.
Real Conversations
Understanding と in its natural habitat — everyday Japanese — reveals its practical utility and subtle nuances. From giving directions to explaining personal habits, と is a common and versatile particle for objective statements. Observe how it naturally conveys inevitability.
- Directions (e.g., asking for a restaurant):
A
B
- Explaining a Process/Machine Function (e.g., using a vending machine):
A
B
- Describing Habits or Tendencies (e.g., chatting with a friend):
A
B
- Making a Discovery (e.g., returning home):
A
B
A
- Social Media/Texting (Casual):
雨が降ると、気分が落ちるよね。 (Ame ga furu to, kibun ga ochiru yo ne.) - "When it rains, my mood drops, doesn't it?" (An objective, commonly experienced reaction or feeling.)
These examples highlight と's role in conveying statements of fact or consistent observation, devoid of personal influence on the outcome.
Progressive Practice
Let's build sentences using と step-by-step, focusing on its core meaning of inevitable consequence and ensuring proper formation.
Simple Natural Consequence (I-Adjective):
- Condition: 暑い (atsui) - hot
- Connection: 暑いと (atsui to) - When it's hot...
- Inevitable Result: 喉が渇く (nodo ga kawaku) - ...you get thirsty.
- Full Sentence: 暑いと、喉が渇く。 (Atsui to, nodo ga kawaku.) - "When it's hot, you get thirsty." (A general physiological truth.)
Directions (Verb):
- Condition: 左に曲がる (hidari ni magaru) - turn left
- Connection: 左に曲がると (hidari ni magaru to) - When you turn left...
- Inevitable Result: 本屋があります (honya ga arimasu) - ...there's a bookstore.
- Full Sentence: 左に曲がると、本屋があります。 (Hidari ni magaru to, honya ga arimasu.) - "When you turn left, there's a bookstore." (An objective fact of location.)
Machine Operation (Noun + だ):
- Condition: 赤いランプが点く (akai ranpu ga tsuku) - the red lamp turns on
- Connection: 赤いランプが点くと (akai ranpu ga tsuku to) - When the red lamp turns on...
- Inevitable Result: エラーだ (eraa da) - ...it's an error.
- Full Sentence: 赤いランプが点くと、エラーだ。 (Akai ranpu ga tsuku to, eraa da.) - "When the red lamp turns on, it's an error." (A mechanical state; a fact.)
Past Discovery (Verb):
- Action: 箱を開ける (hako o akeru) - open the box
- Connection: 箱を開けると (hako o akeru to) - When I opened the box...
- Discovered Fact: 中は空だった (naka wa kara datta) - ...the inside was empty.
- Full Sentence: 箱を開けると、中は空だった。 (Hako o akeru to, naka wa kara datta.) - "When I opened the box, it was empty." (An objective observation at that moment.)
These exercises reinforce the understanding that と describes an automatic, undeniable sequence or co-occurrence, always leading to an objective conclusion.
Quick FAQ
と, offering deeper insights into its practical application and nuances.と be used for future events?Yes, absolutely, as long as the result is considered an inevitable consequence of the future condition. For example, 夏になると、暑くなります。 (Natsu ni naru to, atsuku narimasu.) – "When summer comes, it gets hot." Here, the coming of summer is a future event, and the heat is its inevitable, objective consequence. The key is inevitability, not time.
と always "when"?Not strictly. While "when" or "whenever" often capture its meaning, it's more accurate to think of と as establishing a relationship where "if (and only if) A occurs, then B necessarily follows." The nuance is about logical or natural inevitability rather than pure simultaneity. Sometimes "upon doing A, B happens" or "if you do A, you will find B" (especially in directions) are better fits. The core is the automatic, predictable outcome.
と and たら for discoveries?Both can be used, but with subtle differences. と emphasizes the immediate, direct, and often neutral observation of a consequent state or fact. It feels like simply stating what happened as an inevitable unfolding. たら also implies discovery, but it often carries a stronger sense of the first action being completed before the second event. While と highlights the direct cause-and-effect of the observation, たら can sometimes imply a slightly more deliberate sequence or a discovery that was, perhaps, more consciously sought or even desired. For purely objective, unexpected observations without any hint of intent, と is often chosen.
～ば～ほど? Is that related to と?The ～ば～ほど (-ba -hodo) structure means "the more... the more." It uses the ば conditional form in the first part and is a distinct grammatical pattern specifically for proportional change (e.g., 高ければ高いほど、良い。 (Takakereba takai hodo, yoi.) - "The higher, the better."). While it expresses a conditional relationship, it does not convey the same simple, inevitable, and often instantaneous consequence as と. It describes a relationship where the degree of one thing affects the degree of another.
と?The particle と itself is grammatically neutral. It does not carry inherent politeness or formality. The politeness of the entire sentence is determined by the final predicate (e.g., using です (desu) or ます (masu) forms) and the vocabulary chosen throughout the sentence. The plain forms that precede と are also neutral, thus maintaining the objective tone of the conditional clause.
と express something like "If I don't study, I'll fail"?Yes, this is a correct and common usage, as long as the consequence is genuinely inevitable. You use the negative plain form: 勉強しないと、試験に落ちる。 (Benkyou shinai to, shiken ni ochiru.) – "If you don't study, you will fail the exam." Here, failing is presented as an inevitable consequence of not studying, an objective truth in an academic context. The inevitability is key.
Formation of 'To' Conditional
| Category | Form | Example |
|---|---|---|
|
Verb
|
Dictionary Form + と
|
{行く|いく}と
|
|
i-Adjective
|
Base Form + と
|
{暑い|あつい}と
|
|
na-Adjective
|
Stem + だ + と
|
{静か|しずか}だと
|
|
Noun
|
Noun + だ + と
|
{雨|あめ}だと
|
|
Negative Verb
|
Negative Dictionary + と
|
{行かない|いかない}と
|
Meanings
The particle 'to' creates a conditional clause indicating that a result occurs automatically or inevitably following a specific condition.
Natural Law
Scientific or logical certainty.
“{冬|ふゆ}になると{寒|さむ}くなります。”
“{氷|こおり}を{熱|ねつ}すると{水|みず}になります。”
Habitual Action
Something that happens whenever a routine is performed.
“{学校|がっこう}に{着|つ|}くと、{友達|ともだち}と{話|はな}します。”
“{家|いえ}に{帰|かえ|}ると、すぐに{手|て}を{洗|あら|}います。”
Discovery
Finding out something after an action.
“{ドア|どあ}を{開|あ|}けると、{猫|ねこ}がいました。”
“{箱|はこ}を{開|あ|}けると、{手紙|てがみ}がありました。”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Dict + と
|
{押す|おす}と
|
|
Negative
|
Neg-Dict + と
|
{押さない|おさない}と
|
|
Past (Discovery)
|
Past-Dict + と
|
{押した|おした}と
|
|
i-Adjective
|
Adj + と
|
{寒い|さむい}と
|
|
na-Adjective
|
Adj + だ + と
|
{暇|ひま}だと
|
|
Noun
|
Noun + だ + と
|
{春|はる}だと
|
Formality Spectrum
{左|ひだり}に{曲|ま|}がると、{駅|えき}があります。 (Giving directions)
{左|ひだり}に{曲|ま|}がると、{駅|えき}があるよ。 (Giving directions)
{左|ひだり}に{曲|ま|}がると、{駅|えき}があるね。 (Giving directions)
{左|ひだり}に{曲|ま|}がると、{駅|えき}あるよ。 (Giving directions)
The 'To' Logic Flow
Natural Law
- 冬になると寒い Winter -> Cold
Habit
- 起きると飲む Wake -> Drink
Discovery
- 開けるとあった Open -> Found
To vs Tara vs Ba
Examples by Level
{ボタン|ぼたん}を{押|お|}すと、{電気|でんき}が{つ|}きます。
If you press the button, the light turns on.
{春|はる}になると、{暖|あたた|}かくなります。
When it becomes spring, it gets warm.
{右|みぎ}に{曲|ま|}がると、{公園|こうえん}があります。
If you turn right, there is a park.
{夜|よる}になると、{暗|くら|}くなります。
When it becomes night, it gets dark.
{駅|えき}に{着|つ|}くと、{電話|でんわ}をします。
When I arrive at the station, I will call.
{薬|くすり}を{飲|の|}むと、{元気|げんき}になります。
If you take the medicine, you will get better.
{雨|あめ}が{降|ふ|}ると、{傘|かさ}を{差|さ|}します。
When it rains, I use an umbrella.
{彼|かれ}に{会|あ|}うと、いつも{緊張|きんちょう}します。
Whenever I meet him, I get nervous.
{窓|まど}を{開|あ|}けると、{風|かぜ}が{入|はい|}ってきました。
When I opened the window, the wind came in.
{会議|かいぎ}が{終|お|}わると、{皆|みな}で{食事|しょくじ}に行きます。
When the meeting ends, we all go to eat.
{この|この}ボタンを{押|お|}すと、{自動的|じどうてき}に{保存|ほぞん}されます。
If you press this button, it is saved automatically.
{夏|なつ}になると、{海|うみ}に{行|い|}くのが{楽|たの|}しみです。
When summer comes, I look forward to going to the beach.
{彼|かれ}の{話|はなし}を{聞|き|}くと、{皆|みな}が{笑|わら|}い{出|だ|}しました。
When they heard his story, everyone started laughing.
{気温|きおん}が{下|さ|}がると、{雪|ゆき}が{降|ふ|}る{可能性|かのうせい}があります。
If the temperature drops, there is a possibility of snow.
{本|ほん}を{読|よ|}むと、{新|あたら|}しい{知識|ちしき}が{得|え|}られます。
When you read books, you gain new knowledge.
{道|みち}を{渡|わた|}ると、{左側|ひだりがわ}に{店|みせ}があります。
If you cross the road, there is a shop on the left.
{社会|しゃかい}が{変化|へんか}すると、{人|ひと}々の{価値観|かちかん}も{変|か|}わります。
When society changes, people's values also change.
{経済|けいざい}が{悪化|あっか}すると、{失業率|しつぎょうりつ}が{上|あ|}がります。
If the economy worsens, the unemployment rate rises.
{彼|かれ}の{顔|かお}を{見|み|}ると、{昔|むかし}のことが{思|おも|}い{出|だ|}されます。
When I see his face, the past is brought to mind.
{技術|ぎじゅつ}が{進歩|しんぽ}すると、{生活|せいかつ}が{便利|べんり}になります。
When technology advances, life becomes more convenient.
{歴史|れきし}を{振|ふ|}り{返|かえ|}ると、{同|おな|}じような{過|あやま|}ちが{繰|く|}り{返|かえ|}されています。
When looking back at history, the same mistakes are repeated.
{彼|かれ}の{言葉|ことば}を{聞|き|}くと、{彼|かれ}の{真意|しんい}が{分|わ|}かります。
When you hear his words, you understand his true intent.
{自然|しぜん}を{破壊|はかい}すると、{環境|かんきょう}に{悪影響|あくえいきょう}を{与|あた|}えます。
If you destroy nature, it negatively impacts the environment.
{真実|しんじつ}を{知|し|}ると、{世界|せかい}が{違|ちが|}って{見|み|}えます。
When you know the truth, the world looks different.
Easily Confused
Both can mean 'if/when', but 'to' is for automatic results while 'tara' is for specific future events or personal desires.
Both are conditionals, but 'ba' is more formal and often used for hypothetical situations.
Both are conditionals, but 'nara' is for 'in the case of'.
Common Mistakes
{明日|あした}、{晴|は|}れると、{公園|こうえん}に{行|い|}きます。
{明日|あした}、{晴|は|}れたら、{公園|こうえん}に{行|い|}きます。
{時間|じかん}があると、{本|ほん}を{読|よ|}みたいです。
{時間|じかん}があったら、{本|ほん}を{読|よ|}みたいです。
{明日|あした}、{会|あ|}うと、{話|はな}してください。
{明日|あした}、{会|あ|}ったら、{話|はな}してください。
{お金|おかね}があると、{車|くるま}を{買|か|}います。
{お金|おかね}があったら、{車|くるま}を{買|か|}います。
{彼|かれ}が{来|く|}ると、{呼|よ|}んでください。
{彼|かれ}が{来|く|}たら、{呼|よ|}んでください。
{明日|あした}、{暇|ひま}だと、{遊|あそ|}びましょう。
{明日|あした}、{暇|ひま}だったら、{遊|あそ|}びましょう。
{テスト|てすと}で{合格|ごうかく}すると、{旅行|りょこう}に{行|い|}きます。
{テスト|てすと}で{合格|ごうかく}したら、{旅行|りょこう}に{行|い|}きます。
{もし|もし}、{彼|かれ}が{知|し|}ると、{教|おし|}えてください。
{もし|もし}、{彼|かれ}が{知|し|}ったら、{教|おし|}えてください。
{雨|あめ}が{降|ふ|}ると、{中止|ちゅうし}しましょう。
{雨|あめ}が{降|ふ|}ったら、{中止|ちゅうし}しましょう。
{彼|かれ}が{来|く|}ると、{帰|かえ|}ってください。
{彼|かれ}が{来|く|}たら、{帰|かえ|}ってください。
{状況|じょうきょう}が{変|か|}わると、{計画|けいかく}を{変|か|}えよう。
{状況|じょうきょう}が{変|か|}わったら、{計画|けいかく}を{変|か|}えよう。
{彼|かれ}が{同意|どうい}すると、{契約|けいやく}を{結|むす|}びましょう。
{彼|かれ}が{同意|どうい}したら、{契約|けいやく}を{結|むす|}びましょう。
{問題|もんだい}が{起|お|}きると、{対処|たいしょ}してください。
{問題|もんだい}が{起|お|}きたら、{対処|たいしょ}してください。
{彼|かれ}が{来|く|}ると、{一緒|いっしょ}に{飲|の|}もう。
{彼|かれ}が{来|く|}たら、{一緒|いっしょ}に{飲|の|}もう。
Sentence Patterns
___と、___になります。
___と、___がありました。
___と、いつも___。
___と、___という{結果|けっか}になります。
Real World Usage
{角|かど}を{曲|ま|}ると、{銀行|ぎんこう}があります。
{起|お|}きると、{水|みず}を{飲|の|}みます。
{ボタン|ぼたん}を{押|お|}すと、{保存|ほぞん}されます。
{冬|ふゆ}になると、{寒|さむ}くなります。
{箱|はこ}を{開|あ|}けると、{猫|ねこ}がいました！
{氷|こおり}を{熱|ねつ}すると{水|みず}になります。
The 'Whenever' Test
No Volition
Discovery Usage
Natural Flow
Smart Tips
Use 'to' to emphasize the automatic nature of your routine.
Always use 'to' for clear, objective directions.
Use 'to' to add a sense of surprise to your story.
Use 'to' for scientific or logical truths.
Pronunciation
Particle 'To'
Pronounced like 'toe'. Keep it short and crisp.
Conditional Clause
Condition + と ↗
Rising intonation on 'to' indicates the condition is being set.
Memorize It
Mnemonic
To is for 'Total' certainty. If you have 'Total' certainty, use 'To'.
Visual Association
Imagine a light switch. You press it (Condition) and the light turns on (Result). It happens every time without fail. That is the 'To' switch.
Rhyme
When the result is sure to show, use the particle known as 'To'.
Story
Kenji is a scientist. He loves facts. He never says 'If I want'. He only says 'If I press this, it explodes'. He uses 'To' because he only cares about what happens every single time.
Word Web
Challenge
Look around your room. Find 3 things that happen automatically (e.g., 'If I open the door, I see the hallway'). Write them down using 'To'.
Cultural Notes
Used in formal and informal settings for objective facts.
Often uses 'tara' or 'nara' more frequently, but 'to' remains standard for logical facts.
Used to explain procedures or system behaviors.
The particle 'to' originated as a connective particle in Old Japanese, used to link nouns and clauses.
Conversation Starters
{朝|あさ}、{起|お|}きると{何|なに}をしますか？
{冬|ふゆ}になると、{何|なに}を{食|た|}べたくなりますか？
{道|みち}を{聞|き|}かれたら、どうやって{教|おし|}えますか？
{新|あたら|}しい{技術|ぎじゅつ}が{進歩|しんぽ}すると、{生活|せいかつ}はどうなりますか？
Journal Prompts
Common Mistakes
Test Yourself
{ボタン|ぼたん}を___と、{電気|でんき}が{つ|}きます。
Choose the correct sentence.
Find and fix the mistake:
{時間|じかん}があると、{映画|えいが}を{見|み}たいです。
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
When I wake up, I drink water.
Answer starts with: {起|...
Match each item on the left with its pair on the right:
{春|はる} / {暖|あたた|}かい
Choose the valid sentence.
Score: /8
Practice Exercises
8 exercises{ボタン|ぼたん}を___と、{電気|でんき}が{つ|}きます。
Choose the correct sentence.
Find and fix the mistake:
{時間|じかん}があると、{映画|えいが}を{見|み}たいです。
{駅|えき} / {右|みぎ} / {曲|ま|}がると / に / あります
When I wake up, I drink water.
Match the pairs.
{春|はる} / {暖|あたた|}かい
Choose the valid sentence.
Score: /8
Practice Bank
12 exercisesこのボタンを{押|お}す___、水が出ます。
If you don't hurry, you will be late.
Which sentence shows the 'Discovery' function of `と`?
暇だと、遊びに行こう。
この部屋は{静|しず}か___、よく眠れます。
Whenever I see him, I feel happy.
Select the correct form for 'If you don't go...'
勉強すると、合格してください。(Benkyou suru to, goukaku shite kudasai.)
{日曜日|にちようび}___、道が混みます。
Score: /12
FAQ (8)
No, 'to' is for inevitable results. Use 'tara' for future plans.
It is neutral and used in all registers.
Yes, but you must add 'da' (e.g., 'ame da to').
'To' is for inevitable consequences, while 'tara' is for specific future events or personal wishes.
No, 'to' cannot be used for commands or requests.
Because 'to' is for objective facts, not personal desires.
Yes, it is very common for giving directions.
Yes, it is perfect for scientific facts.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Si + presente
Japanese has multiple particles for different types of conditions, whereas Spanish uses one.
Si + présent
Japanese 'to' cannot be used for personal wishes or commands.
Wenn + verb
Japanese 'to' is more restrictive regarding volitional outcomes.
Ru guo / Yi... jiu...
Japanese 'to' is a particle, while Chinese uses a two-part structure.
Idha
Arabic 'idha' can be used for future events, while 'to' cannot.
If / When
Japanese 'to' is strictly for automatic, objective consequences.
Learning Path
Prerequisites
Related Videos
02:11 それもいいね / Wakeys【Music Video】
12:46 志村けん 芸者コント
03:56 【MAD】Naruto/ナルト／自来也『Sign』
Lesson 30: Japanese conditionals: とTO. What the textbooks don't tell you.
Organic Japanese with Cure Dolly
How to say "IF" in Japanese | A CONCISE guide to the たら、と、 ば and なら conditionals
Norman Vargas
Mastering Japanese Conditionals: と, たら, ば, なら
Learn Japanese with Moon-chan
Related Grammar Rules
Assuming scenarios with 'としたら' and 'とすれば'
Overview At the B2 level, moving beyond simple conditionals is essential for nuanced expression. The grammar patterns `...
If I could (Impossible Wish) (~mono nara)
Overview In Japanese, standard conditionals like `~たら` (`-tara`) or `~ば` (`-ba`) handle realistic 'if-then' scenarios...
The More... The More (～ば～ほど)
Overview The Japanese grammar pattern `～ば～ほど` (`ba~hodo`) precisely articulates a proportional relationship: "the m...
Useless Efforts: Even if... (~たところで)
Overview At the C1 level, moving beyond simple conditionals to express complex sentiments is key. The grammar pattern ~...
Turning Points: Once it becomes... (~ともなると)
Overview The grammar pattern `~ともなると` (and its partner `~ともなれば`) provides a way to express a significant turn...
