Logic & Expectations: ~Hazu (It should be...)
~hazu when you are 90% sure of a result because you have facts, logic, or a schedule to back it up.
Grammar Rule in 30 Seconds
Use {筈|はず} (hazu) to express a logical expectation or a strong assumption that something should be true.
- Attach {はず|はず} to the dictionary form of verbs: {行く|いく}はずです (It should go).
- Attach {はず|はず} to the plain past form for past expectations: {行った|いった}はずです (It should have gone).
- For nouns, use {の|の} + {はず|はず}: 学生のはずです (They should be a student).
Overview
Japanese grammar often provides distinct expressions for subtle nuances of meaning that English might collapse into a single word like "should." The structure ~hazu (はず) is one such crucial distinction, marking a logical expectation or deduction based on objective evidence, known facts, or established patterns. It conveys a high degree of certainty—typically around 90-95%—that a situation or event is true, will occur, or should have occurred, given the available information. Unlike mere speculation, ~hazu signifies a reasoned conclusion, implying that any deviation from this expectation would be surprising or illogical.
Think of ~hazu as a statement of high probability derived from observable facts or known circumstances. You aren't guessing or expressing a personal desire; you are articulating what must logically be the case. For instance, if you know a store closes at 7 PM and it's already 8 PM, you might state, Ano mise wa mou shimatte iru hazu desu (あの店はもう閉まっているはずです - "That store should already be closed").
This isn't a prediction; it's an informed deduction. Understanding ~hazu is essential for expressing logical reasoning and anticipating outcomes in Japanese.
How This Grammar Works
hazu is treated as a nominal entity, functioning similarly to a noun. This characteristic dictates its connection rules to preceding clauses, which effectively modify hazu to specify what the expectation is about. The core concept is that a statement (expressed by a verb, adjective, or noun phrase) is presented as the content of this logical "expectation" or "certainty."hazu introduces the logical conclusion drawn from that premise. For example, in Kare wa mainichi benkyou shite iru kara, shiken ni goukaku suru hazu desu (彼は毎日勉強しているから、試験に合格するはずです - "Since he studies every day, he should pass the exam"), the act of "studying every day" forms the evidence supporting the expectation of "passing the exam." This grammatical mechanism enables speakers to convey not just a statement, but the logical foundation behind it.hazu is a noun, it can be followed by copulas like da (casual) or desu (polite) to form a complete sentence, or it can be followed by particles to create more complex sentence structures. Its flexibility allows it to express expectations about present states, past events, or future occurrences by adjusting the tense of the modifying clause. Mastering ~hazu allows you to articulate logical inferences with precision, lending authority and clarity to your Japanese expressions.Formation Pattern
~hazu depends on the part of speech of the word directly preceding it. Remember that hazu functions as a noun, which simplifies its connection rules, but specific particles are required for na-adjectives and nouns. Pay close attention to these particles, as they are common points of error for learners.
da (casual) or desu (polite).
hazu da | iku hazu da (行くはずだ - Should go) | iku hazu desu (行くはずです - Should go) |
itta hazu da (行ったはずだ - Should have gone) | itta hazu desu (行ったはずです - Should have gone) |
ikanai hazu da (行かないはずだ - Should not go) | ikanai hazu desu (行かないはずです - Should not go) |
ikanakatta hazu da (行かなかったはずだ - Should not have gone) | ikanakatta hazu desu (行かなかったはずです - Should not have gone) |
hazu da | takai hazu da (高いはずだ - Should be expensive) | takai hazu desu (高いはずです - Should be expensive) |
takakunai hazu da (高くないはずだ - Should not be expensive) | takakunai hazu desu (高くないはずです - Should not be expensive) |
na + hazu da | kantan na hazu da (簡単なはずだ - Should be simple) | kantan na hazu desu (簡単なはずです - Should be simple) |
kantan ja nai hazu da (簡単じゃないはずだ - Should not be simple) | kantan ja nai hazu desu (簡単じゃないはずです - Should not be simple) |
no + hazu da | sensei no hazu da (先生のはずだ - Should be a teacher) | sensei no hazu desu (先生のはずです - Should be a teacher) |
sensei ja nai hazu da (先生じゃないはずだ - Should not be a teacher) | sensei ja nai hazu desu (先生じゃないはずです - Should not be a teacher) |
na for na-adjectives and no for nouns are non-negotiable. Omitting them will result in grammatically incorrect sentences. These particles serve to grammatically link the preceding element to hazu, which, as a noun, requires a nominal modifier (or an attributive form for adjectives and verbs).
da or desu determines the politeness. Both forms carry the same logical meaning.
When To Use It
~hazu is employed in situations where your expectation or assertion stems from a rational basis, allowing you to present a confident, yet not absolute, statement about reality. It is crucial to distinguish this from mere personal opinion or vague possibility; ~hazu requires underlying evidence or a logical inference.- 1Logical Deduction from Facts or Evidence: This is the most common and fundamental use. When you have concrete information—a schedule, a known characteristic, a past event—that leads you to a certain conclusion,
~hazuis appropriate. The certainty is high because it's grounded in objective reality.
- Example:
Densha wa kuji ni deru kara, juuji ni tsuku hazu desu.(電車は9時に出るから、10時に着くはずです。 - "The train leaves at 9, so it should arrive at 10.") – Based on the timetable. - Example:
Kono pasokon wa atarashii kara, hayai hazu da.(このパソコンは新しいから、速いはずだ。 - "This computer is new, so it should be fast.") – Based on general knowledge about new technology.
- 1Confirming an Expectation or Belief: You use
~hazuto express that something is as you expected it to be, or to seek confirmation if you're slightly unsure but believe it's correct. It implies, "If everything is as it should be, then X is true."
- Example:
Kagi wa tsukue no ue ni atta hazu dakedo...(鍵は机の上にあったはずだけど… - "The key should have been on the desk, but...") – Expressing an expectation that might be challenged. - Example:
Shukudai wa kinou dashita hazu desu yo.(宿題は昨日出したはずですよ。 - "I should have submitted the homework yesterday.") – Confirming one's own action, with an implicit expectation it was completed.
- 1Expressing Disappointment or Surprise (
~hazu nanonior~hazu ga nai): When something that logically should be true or happen doesn't,~hazucombines withno ni(のに) orga nai(が無い -hazu ga nai) to convey surprise, disappointment, or a strong negation.~hazu nanoniindicates an unfulfilled expectation, often with a sense of regret or bewilderment.
- Example:
Ame ga yanda hazu nanoni, mada futte iru.(雨が止んだはずなのに、まだ降っている。 - "It should have stopped raining, but it's still raining.") – Surprise at a deviation from the expected outcome. - Example:
Koko ni aru hazu ga nai!(ここにあるはずがない！ - "It absolutely shouldn't be here!") – Strong denial based on logical impossibility.
- 1Justifying a Statement or Action: By using
~hazu, you provide a logical backing for your assertion, making it more persuasive. It grounds your statement in observable reality, rather than mere opinion.
- Example:
Kare wa seikaku ga ii kara, minna ni suki na hazu da.(彼は性格がいいから、みんなに好きなはずだ。 - "He has a good personality, so everyone should like him.") – Justifying an expectation based on a known trait.
~hazu equips you with the ability to articulate these deductions with precision in Japanese.Common Mistakes
~hazu due to its English equivalent "should," which carries multiple meanings. Japanese maintains distinct grammatical patterns for these nuances. Understanding these pitfalls is crucial for accurate and natural usage.- 1Confusing Logical Expectation with Moral Obligation (
~beki): This is perhaps the most significant mistake. While English "should" can mean both "it is logically expected" and "one is morally obliged,"~hazuonly covers the former. For moral obligation, advice, or duty, you must use~beki(べき) or similar expressions.
- Incorrect:
Anata wa motto benkyou suru hazu da.(Intended: "You should study more.") – This sounds like you're logically deducing they will study more, not advising them. - Correct:
Anata wa motto benkyou suru beki da.(あなたはもっと勉強するべきだ。 - "You should study more [because it's your duty/for your benefit].") - Correct (Hazu):
Kare wa isshoukenmei benkyou shite iru kara, shiken ni goukaku suru hazu da.(彼は一生懸命勉強しているから、試験に合格するはずだ。 - "He studies diligently, so he should pass the exam [logical deduction].")
- 1Confusing High Probability (
~hazu) with Pure Speculation (~darou,~kamoshirenai):~hazuimplies a strong, evidence-based deduction. It's not for mere guesses or lower certainty predictions.
- Incorrect:
Ashita ame ga furu hazu da.(Said without specific weather data. Implies a certainty based on undisclosed logic.) - Correct (Speculation):
Ashita ame ga furu darou.(明日雨が降るだろう。 - "It will probably rain tomorrow.") - Correct (Possibility):
Ashita ame ga furu kamoshirenai.(明日雨が降るかもしれない。 - "It might rain tomorrow.") - Correct (Hazu, with evidence):
Saikin zutto kumori da kara, ashita mo ame ga furu hazu da.(最近ずっと曇りだから、明日も雨が降るはずだ。 - "It's been cloudy recently, so it should rain tomorrow [logical deduction based on weather pattern].")
- 1Incorrect Particle Usage for na-Adjectives and Nouns: As outlined in the formation section, the
naandnoparticles are vital for connecting na-adjectives and nouns tohazu. Omitting them is a common grammatical error.
- Incorrect:
Hima hazu da.(Missingna) - Correct:
Hima na hazu da.(暇なはずだ。 - "Should be free.") - Incorrect:
Kyujitsu hazu desu.(Missingno) - Correct:
Kyujitsu no hazu desu.(休日のはずです。 - "Should be a holiday.")
- 1Using
~hazufor Personal Intentions or Wishes:~hazuexpresses an objective expectation. It's not suitable for stating your own plans or desires, which require different grammar patterns like~tsumori(つもり) for intention or simple plain form verbs for future actions.
- Incorrect:
Watashi wa paatii ni iku hazu desu.(Implies a logical deduction that you will go, not your intention.) - Correct:
Watashi wa paatii ni iku tsumori desu.(私はパーティーに行くつもりです。 - "I intend to go to the party.") - Correct (Hazu, from another's perspective):
Kare wa paatii ga suki dakara, iku hazu desu.(彼はパーティーが好きだから、行くはずです。 - "He likes parties, so he should go [logical deduction].")
~hazu effectively.Real Conversations
~hazu is ubiquitous in spoken and written Japanese, appearing across various contexts from casual banter to formal work discussions. Its utility lies in its ability to quickly convey reasoned certainty.
1. Confirming Plans/Schedules (Work/Formal):
- Scenario: A colleague is checking the meeting time.
- Dialogue: Kaigi wa san-ji kara no hazu desu yo ne? (会議は3時からのはずですよね？ - "The meeting should be from 3 o'clock, right?")
- Observation: The use of ~hazu desu yo ne? is a polite way to seek confirmation based on a previously known schedule, implying "My understanding is that it's at 3, please confirm."
2. Expressing a Logical Deduction (Casual/Friends):
- Scenario: Friends discussing a mutual acquaintance.
- Dialogue: Ken-chan, kinou no paatii ni kita? (健ちゃん、昨日のパーティーに来た？ - "Did Ken come to the party last night?")
- Uun, kita hazu da yo. Saikin hima tte itteta kara. (うん、来たはずだよ。最近暇って言ってたから。 - "Yeah, he should have come. He said he's been free recently.")
- Observation: The speaker uses kita hazu da yo to express a strong inference based on Ken's recent statement of being free, a logical reason for him to attend.
3. Lamenting an Unmet Expectation (Everyday Annoyance):
- Scenario: Someone can't find their wallet.
- Dialogue: Saifu ga nai! Saisho ni kokoro ni atta hazu nanoni! (財布がない！最初に此処にあったはずなのに！ - "My wallet's gone! It should have been here first!")
- Observation: The ~hazu nanoni construction powerfully conveys frustration and confusion when reality contradicts a firm logical expectation. The implicit meaning is "I'm certain it was here, so why isn't it now?"
4. Strong Negative Deduction/Impossibility (~hazu ga nai):
- Scenario: Someone makes an unbelievable claim.
- Dialogue: Kare ga shigoto wo yameta tte? Uso da! Sonna hazu ga nai. (彼が仕事を辞めたって？嘘だ！そんなはずがない。 - "He quit his job? No way! That can't be.")
- Observation: Sonna hazu ga nai ({そんなはずがない}) is a very common idiomatic expression for "That's impossible!" or "That can't be true!" It asserts a strong logical impossibility based on known facts about the person or situation (e.g., he loves his job, he just got promoted).
These examples illustrate how ~hazu is integral to expressing logical reasoning in Japanese. It's not merely a theoretical grammar point but a practical tool for daily communication, enabling speakers to articulate their deductions and expectations clearly.
Quick FAQ
~hazu, offering practical clarifications and expanding on its usage.~hazu be used in the past tense?hazu datta (はずだった) or hazu deshita (はずでした). This construction often carries a nuance of disappointment, regret, or that the expectation was ultimately unfulfilled.- Example:
Kinou tsuku hazu datta noni, mada konai.(昨日着くはずだったのに、まだ来ない。 - "It was supposed to arrive yesterday, but it hasn't come yet.") - Example:
Kanojo wa koko ni iru hazu datta.(彼女は此処にいるはずだった。 - "She should have been here [but she isn't].")
~hazu? (It shouldn't be...)~hazu, each with a slightly different emphasis:- 1Negating the preceding clause: This is the most straightforward. You simply put the verb, i-adjective, na-adjective, or noun into its negative plain form before
hazu da/desu. This means "It should be that X is not true."
- Example:
Kare wa mada kodomo dakara, konna muzukashii koto wa wakaranai hazu da.(彼はまだ子供だから、こんな難しいことは分からないはずだ。 - "He's still a child, so he shouldn't understand such difficult things.")
- 1Using
~hazu ga nai(はずがない): This expresses a very strong denial or logical impossibility, meaning "There's no way that X is true" or "X absolutely cannot be the case." It's more emphatic than simply negating the preceding clause and often indicates surprise or disbelief.
- Example:
Ano uragirimono ga shinjirareu hazu ga nai.(あの裏切り者が信じられるはずがない。 - "There's no way that traitor can be believed.") - Example:
Kono mondai wa konnan ja nai hazu ga nai.(この問題は簡単じゃないはずがない。 - "This problem absolutely can't be not simple / It must be simple.") – This is a double negative, meaning it must be simple, but the structure remains consistent.
~hazu formal or casual?~hazu itself is neutral. Its politeness level is determined by the final copula:~hazu da(はずだ): Casual form, suitable for friends, family, or in informal settings.~hazu desu(はずです): Polite form, suitable for colleagues, superiors, or in formal situations.
~hazu be used mid-sentence?hazu can appear mid-sentence, typically followed by particles like ga (が) or de (で) to connect to a subsequent clause, often to express a contrast or a reason.- Example:
Kare wa kuru hazu ga, mada kite inai.(彼は来るはずが、まだ来ていない。 - "He should come, but he hasn't arrived yet.") – Here,hazu gaconnects the expectation to a contradictory reality.
~hazu allows for more sophisticated and nuanced expression in Japanese, enabling you to articulate complex logical thoughts effectively.Hazu Formation Table
| Category | Affirmative | Negative | Past |
|---|---|---|---|
|
Verb
|
行くはず
|
行かないはず
|
行ったはず
|
|
I-Adj
|
忙しいはず
|
忙しくないはず
|
忙しかったはず
|
|
Na-Adj
|
静かなはず
|
静かではないはず
|
静かだったはず
|
|
Noun
|
学生のはず
|
学生ではないはず
|
学生だったはず
|
Meanings
Indicates a high degree of certainty based on logic or evidence. It translates to 'it is expected that' or 'it should be'.
Logical Expectation
Something is expected to be true based on facts.
“{電車|でんしゃ}は10{時|じ}に{着く|つく}はずです。”
“{彼|かれ}は{今日|きょう}は{休み|やすみ}のはずです。”
Past Expectation
Something was expected to have happened.
“{鍵|かぎ}は{机|つくえ}の{上|うえ}に{置いた|おいた}はずです。”
“{彼女|かのじょ}は{昨日|きのう}は{来る|くる}はずでした。”
Negative Expectation
Something is expected not to happen.
“{彼|かれ}はそんなことを{言う|いう}はずがありません。”
“{失敗|しっぱい}するはずはない。”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Present
|
Verb(dict) + Hazu
|
行くはず
|
|
Past
|
Verb(past) + Hazu
|
行ったはず
|
|
Negative
|
Verb(dict) + Hazu ga nai
|
行くはずがない
|
|
Noun
|
Noun + no + Hazu
|
学生のはず
|
|
Na-Adj
|
Na-Adj + na + Hazu
|
静かなはず
|
|
I-Adj
|
I-Adj + Hazu
|
忙しいはず
|
Formality Spectrum
彼は来るはずでございます。 (Arrival)
彼は来るはずです。 (Arrival)
彼は来るはずだ。 (Arrival)
来るっしょ。 (Arrival)
Hazu Logic Flow
Basis
- Evidence Fact-based
Strength
- High Strong confidence
Examples by Level
{明日|あした}は{晴れる|はれる}はずです。
It should be sunny tomorrow.
{彼|かれ}は{来る|くる}はずです。
He should come.
{店|みせ}は{開いている|あいている}はずです。
The shop should be open.
{バス|ばす}は{来る|くる}はずです。
The bus should come.
{鍵|かぎ}は{鞄|かばん}に{ある|ある}はずです。
The key should be in the bag.
{彼女|かのじょ}は{学生|がくせい}のはずです。
She should be a student.
{昨日|きのう}は{忙しかった|いそがしかった}はずです。
He should have been busy yesterday.
{静か|しずか}なはずです。
It should be quiet.
{彼|かれ}がそんなことを{言う|いう}はずがありません。
There is no way he would say such a thing.
{会議|かいぎ}は{終わった|おわった}はずです。
The meeting should have finished.
{道|みち}は{混んでいない|こんでいない}はずです。
The road shouldn't be crowded.
{彼|かれ}は{知っている|しっている}はずです。
He should know about it.
{計画|けいかく}は{順調|じゅんちょう}に{進んでいる|すすんでいる}はずです。
The plan should be proceeding smoothly.
{彼|かれ}の{説明|せつめい}は{正しい|ただしい}はずです。
His explanation should be correct.
{予算|よさん}は{足りる|たりる}はずです。
The budget should be sufficient.
{彼|かれ}は{納得|なっとく}したはずです。
He should have been convinced.
{事態|じたい}は{改善|かいぜん}されるはずです。
The situation should be improved.
{彼|かれ}が{欠席|けっせき}するはずはありません。
It is impossible that he would be absent.
{理論|りろん}は{成立|せいりつ}するはずです。
The theory should hold up.
{結果|けっか}は{反映|はんえい}されるはずです。
The results should be reflected.
{歴史的|れきしてき}な{観点|かんてん}から{見れば|みれば}、{当然|とうぜん}の{結果|けっか}であるはずです。
From a historical perspective, it should be the natural result.
{彼|かれ}の{行動|こうどう}は{予測|よそく}の{範囲内|はんいない}であるはずです。
His actions should be within the range of prediction.
{社会|しゃかい}の{構造|こうぞう}は{変化|へんか}するはずです。
The structure of society should change.
{彼|かれ}の{意図|いと}は{理解|りかい}されるはずです。
His intentions should be understood.
Easily Confused
Tsumori is intention, Hazu is expectation.
Both express conjecture.
Both express certainty.
Common Mistakes
行きますはず
行くはず
先生はず
先生のはず
忙しいいはず
忙しいはず
行くのはず
行くはず
静かはず
静かなはず
行ったのはず
行ったはず
行くはずですだ
行くはずです
行くはずだと思っている
行くはずだ
行くはずがないです
行くはずがない
行ったはずだでしょう
行ったはずでしょう
行くはずだっただろう
行くはずだった
Sentence Patterns
___ は ___ はずです。
___ は ___ のはずです。
___ は ___ はずがありません。
___ は ___ はずでした。
Real World Usage
もう着くはず！
資料は送ったはずです。
ここにあるはずなんだけど...
今日は晴れるはず！
もう届くはずです。
私の経験は役に立つはずです。
Not for Guessing
hazu if you are just guessing wildly. If you see dark clouds and say 'It should rain', that's fine (visual evidence). But if you just feel it in your bones, ni chigainai is better.Softening the Blow
Sonna hazu wa nai desu ga...) to indirectly suggest checking again.The Ultimate Excuse
Mani-au hazu datta n desu ga... (I expected to make it on time...). It shifts the blame to the universe/traffic rather than your poor planning.Smart Tips
Use Hazu to sound more logical.
Use Hazu ga nai for emphasis.
Use past plain form.
Don't forget 'no'.
Pronunciation
Hazu
Pronounce as 'ha-zu' with a short 'a' and 'u'.
Falling
Hazu ↓
Certainty
Memorize It
Mnemonic
Think of 'Hazu' as 'Has to be'. If it 'has to be', it is an expectation.
Visual Association
Imagine a detective looking at a clock. He says, 'The train has to be here by now!'
Rhyme
It should be true, it's Hazu for you.
Story
Ken checked his watch. The train was due at 5:00. He said, 'It should be here.' He used Hazu because he saw the schedule.
Word Web
Challenge
Look at your calendar and make 3 sentences using Hazu about your day.
Cultural Notes
Using Hazu shows you have done your research.
Used to reassure friends.
Used to state logical conclusions.
Hazu originally meant the 'edge' or 'notch' of an arrow.
Conversation Starters
What time should the train arrive?
Is the shop open today?
Should he have finished the work?
Is it possible for it to fail?
Journal Prompts
Common Mistakes
Test Yourself
彼は明日来る___です。
Which is correct?
Find and fix the mistake:
先生はずです。
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
He should be a student.
Answer starts with: 彼は学...
Use 'kaigi' and 'owaru'.
Match each item on the left with its pair on the right:
I checked the schedule. The train ___.
Score: /8
Practice Exercises
8 exercises彼は明日来る___です。
Which is correct?
Find and fix the mistake:
先生はずです。
はず / 雨 / 降る / です
He should be a student.
Use 'kaigi' and 'owaru'.
Hazu ga nai
I checked the schedule. The train ___.
Score: /8
Practice Bank
10 exercisesKare wa sensei ___ hazu da. (He should be a teacher.)
What does 'Kuru hazu datta' mean?
Kono baggu wa takai no hazu da.
到着 / はず / する / 十時に / 電車は
Match the Japanese to the English meaning.
Kanojo wa ____ hazu da. (She should be kind.)
There is no way he knows that.
Using 'hazu' implies:
Watashi wa iku hazu desu. (I intend to go.)
ない / ミス / は / の / はず
Score: /10
FAQ (8)
Yes, but it's rare. It sounds like you are analyzing your own situation objectively.
It is neutral. It works in both casual and business settings.
Use 'kamoshirenai' or 'darou' instead.
Yes, 'ta-form + hazu' is very common.
It's a grammatical requirement to link the noun to the auxiliary.
Very. It's the standard way to express disbelief.
Hazu is evidence-based; Ni chigainai is subjective conviction.
Yes, it's very common in reports and essays.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Debería
Debería is a verb conjugation, Hazu is an auxiliary noun.
Devrait
French uses conditional mood; Japanese uses plain form + noun.
Sollte
German uses modal verbs; Japanese uses a noun-based structure.
应该
Chinese is an adverbial marker; Japanese is a sentence-final structure.
ينبغي
Arabic is a verb-based structure.
Should
English uses a modal auxiliary verb.
Learning Path
Prerequisites
Related Videos
Related Grammar Rules
The Extreme Emphasis Pattern: ~極まる / ~極まりない (Kiwamaru / Kiwamarinai)
Overview At the advanced stages of Japanese, expressing simple intensity with words like `とても` (totemo) or `非常に`...
Expressing Desire: "I want to..." (～tai)
Overview Japanese offers nuanced ways to express personal desire. The suffix `~tai` (～たい) is fundamental for articula...
Uncontrollable Feelings: ~てならない (~te naranai)
Overview Japanese grammar provides a rich toolkit for expressing internal states, and `~てならない` (`~te naranai`) is...
Before Doing X (Mae ni)
Overview In Japanese, establishing a clear sequence of events is fundamental to communication. The grammatical pattern...
Literary Similes: Like & As If (~gotoku / ~gotoki)
Overview Japanese offers several ways to express similes, but few carry the profound literary weight and stylistic versa...
