B2 · 中上級 チャプター 5

Hypotheticals, Regrets, and Advanced Timelines

6 トータルルール
64 例文
7

Chapter in 30 Seconds

Unlock the power of 'what if' and master complex timelines in French.

  • Construct complex hypothetical scenarios using 'si' clauses.
  • Express past regrets and missed opportunities with nuance.
  • Predict future completed actions using the future perfect tense.
Master the art of possibility and reflection.

学べること

Get ready for an exciting journey into the deeper layers of French! This chapter is where your conversations get a serious upgrade. We're going beyond simple statements to help you express those intricate 'what if' scenarios, talk about past regrets, and even predict future completed actions like a pro. You'll start by mastering the fundamental 'si' rule – learning how to say if this happens... correctly, even when talking about the future. Then, we'll dive into dreaming in French, exploring how to build beautiful hypothetical sentences like

if I were rich, I would travel the world.
But what about those moments you wish you could change? You'll learn to express past regrets, like
Oh, I should have studied more!
or
I would have called you if I had known.
We'll connect these ideas to form full third conditional sentences, allowing you to explain how the past would have been different. Finally, we'll fast-forward to the future perfect, the 'finish line' tense. Imagine telling your friend,
By the time you arrive, I will have finished dinner.
It's perfect for complex planning or making smart guesses about past events. By the end of this chapter, you won't just be speaking French; you'll be thinking in French, navigating complex ideas with confidence. You'll be able to have nuanced conversations, express your deepest wishes, and recount complex stories with ease. Don't worry, even though it sounds advanced, we'll break it down step-by-step. You've got this!

Learning Objectives

By the end of this chapter, you will be able to:

  1. 1
    By the end you will be able to: Build a complex sentence chain expressing past regrets and hypothetical outcomes.

チャプターガイド

Overview

Welcome to a pivotal chapter in your B2 French grammar journey! This is where you elevate your communication from functional to truly nuanced, tackling the intricate world of French hypotheticals, regrets, and advanced timelines. Mastering these structures will unlock a new level of conversational sophistication, allowing you to express complex ideas like what if,
I wish I had,
and
by then, it will have happened.
You're moving beyond simple statements to articulate possibilities, ponder past choices, and project actions into the future with precision.
In this guide, we'll demystify key concepts such as the famous 'Si' rule: No Future allowed!, which governs conditional statements. You'll learn to construct elegant French hypotheticals using the Imparfait and Conditionnel Présent, and confront those moments of reflection with French past regrets using the powerful Conditionnel Passé. We'll then weave these elements together to form complete French past conditionals (often called the third conditional), enabling you to describe how the past might have unfolded differently.
Finally, we'll fast-forward to the Futur Antérieur, or French Future Perfect, a sophisticated tense for discussing actions completed before a future point. By the end, you’ll not just understand these rules; you’ll be applying them confidently in your spoken and written French, making your conversations richer and more authentic.

How This Grammar Works

Let's break down these powerful French grammar tools, starting with the foundational 'Si' rule: No Future allowed!. When you want to express a condition that might happen in the future, the clause following si (if) must always be in the présent (present tense), even if the condition is future-oriented. For example: *Si tu viens, nous irons au marché.* (If you come, we will go to the market.) Notice how viens (come) is present, not future.
Next, we dive into French Hypotheticals: Using Si + Conditional. To talk about what *would happen* if something *were* true now or in the future, you pair si with the Imparfait (imperfect) in the condition clause, and the Conditionnel Présent (present conditional) in the result clause. This is your
if I were rich, I would travel
structure.
For instance: *Si j'avais le temps, je lirais ce livre.* (If I had the time, I would read this book.) Here, avais (had) is imperfect, and lirais (would read) is present conditional.
When reflecting on the past, you'll encounter French Past Regrets: 'Would Have' (Conditionnel Passé) and Expressing Regret: I Should Have... (Conditionnel Passé). The Conditionnel Passé is formed with the Conditionnel Présent of avoir or être and the past participle of the main verb.
It's used for actions that *would have* happened or *should have* happened but didn't. For example: *J'aurais dû étudier davantage.* (I should have studied more.) or *Je serais venu si j'avais pu.* (I would have come if I had been able to.)
These ideas lead directly to French Past Conditionals: The 'What If' of the Past (Si-clauses), often called the third conditional. This structure describes an unrealized past condition and its unrealized past result. It uses si + Plus-que-parfait (pluperfect) in the condition clause, and the Conditionnel Passé in the result clause.
Example: *Si j'avais su, je serais venu.* (If I had known, I would have come.) This implies you didn't know, and therefore didn't come.
Finally, we have the French Future Perfect: The 'Finish Line' Tense (Le futur antérieur). This tense expresses an action that *will be completed* before another future action or a specific future point. It's formed with the Futur Simple of avoir or être and the past participle.
For example: *Quand tu arriveras, j'aurai déjà mangé.* (When you arrive, I will have already eaten.) It can also express a strong assumption about a past event: *Il aura sûrement oublié son rendez-vous.* (He will have surely forgotten his appointment.) These structures add incredible depth to your B2 French conversations.

Common Mistakes

  1. 1Wrong: *Si tu auras le temps, tu viendras me voir.*
Correct: *Si tu as le temps, tu viendras me voir.*
*Explanation:* The si-clause (if-clause) expressing a condition that might happen in the future always uses the présent (present tense), not the futur simple (simple future). The future tense is reserved for the main clause.
  1. 1Wrong: *Si j'avais su, je viendrais avec toi.*
Correct: *Si j'avais su, je serais venu avec toi.*
*Explanation:* For past hypotheticals (the third conditional), the si-clause requires the plus-que-parfait (pluperfect – *j'avais su*) and the main clause requires the conditionnel passé (past conditional – *je serais venu*), not the conditionnel présent (*je viendrais*). This refers to something that *would have* happened if a past condition *had been* met.
  1. 1Wrong: *Je devrais t'appeler hier.*
Correct: *J'aurais dû t'appeler hier.*
*Explanation:* To express a past regret or an unfulfilled past obligation ('should have'), you must use the conditionnel passé (past conditional) of devoir (aurais dû), not the conditionnel présent (devrais), which means 'I should' (present advice).

Real Conversations

A

A

*Si tu viens à Paris, dis-le-moi. Nous pourrions prendre un café.* (If you come to Paris, tell me. We could have a coffee.)
B

B

*Bien sûr ! Si j'ai le temps, je t'appellerai dès mon arrivée.* (Of course! If I have the time, I'll call you as soon as I arrive.)
A

A

*Si j'étais plus jeune, je ferais le tour du monde en sac à dos.* (If I were younger, I would backpack around the world.)
B

B

*Moi aussi ! Mais si on avait gagné à la loterie, on l'aurait fait, n'est-ce pas ?* (Me too! But if we had won the lottery, we would have done it, wouldn't we?)
A

A

*J'aurais dû réviser plus pour l'examen. Maintenant, je ne suis pas sûr d'avoir réussi.* (I should have revised more for the exam. Now, I'm not sure I passed.)
B

B

*Ne t'inquiète pas. D'ici demain soir, les résultats seront déjà affichés, et tu auras toutes les réponses.* (Don't worry. By tomorrow evening, the results will already be posted, and you will have all the answers.)

Quick FAQ

Q

*What's the difference between "si j'avais and si j'avais eu" in French hypotheticals?*

"Si j'avais

(if I had) uses the imparfait and implies a present or future hypothetical.
Si j'avais eu" (if I had had) uses the plus-que-parfait and refers to a past, unrealized condition.

Q

*How do I express 'I should have done something' in French?*

You use the conditionnel passé of devoir followed by an infinitive. For example, "J'aurais dû + infinitif" (I should have + past participle).

Q

*When should I use the Futur Antérieur in French?*

The Futur Antérieur (future perfect) is used to express an action that will be completed before another future action, or to make a supposition about a past event.

Q

*Can I use 'si' with the future tense in French?*

No, you can never use the futur simple (simple future) directly after si when it means 'if'. Instead, use the présent (present tense) in the si-clause, even if the condition refers to the future.

Cultural Context

French speakers use these advanced timelines and conditional structures constantly, not just for accuracy but for politeness and nuance. The Conditionnel Présent is often employed for soft requests or suggestions, like *Je voudrais...* (I would like...)

重要な例文 (8)

1

J'aurais aimé voir ce film avec toi.

君と一緒にその映画を観たかったな。

フランス語の過去の後悔:「〜すればよかった」(Conditionnel Passé)
2

Tu aurais dû m'appeler avant de venir.

来る前に電話してくれるべきだったよ。

フランス語の過去の後悔:「〜すればよかった」(Conditionnel Passé)
3

I should have charged my phone last night.

昨日の夜、携帯を充電しておくべきだった。

後悔を伝える:〜すべきだった(条件法過去)
4

I would have liked a café au lait, please.

カフェオレをいただきたかったのですが(お願いします)。

後悔を伝える:〜すべきだった(条件法過去)
5

Si j'avais su que tu organisais une fête, je serais venu !

もし知っていたら、行ったのに!

フランス語の過去条件法:もし〜だったら(Si節の用法)
6

Si tu avais étudié davantage, tu aurais réussi ton examen de français.

もっと勉強していたら、フランス語の試験に合格していただろうね。

フランス語の過去条件法:もし〜だったら(Si節の用法)
7

Dès que j'aurai fini mes devoirs, je sortirai.

宿題が終わったら、外出します。

フランス語の未来完了:「完了」を表す時制 (Le futur antérieur)
8

Il n'a pas répondu ; il aura oublié son téléphone.

返信がないね。彼は電話を忘れたんだろう。

フランス語の未来完了:「完了」を表す時制 (Le futur antérieur)

ヒントとコツ (4)

⚠️

「-rais」の罠に注意!

「si」の直後に「-rais」で終わる条件法は絶対に使わないで。フランス語には「Les 'si' n'aiment pas les '-rais'!(siは-raisが嫌い)」という有名な覚え方があるんだ。「"Si j'aurais su« は間違いで、正しくは »Si j'avais su" だよ。」
frontend.learn_grammar.from_rule: 「Si」のルール:未来形は禁止です! (Si + Présent)
⚠️

Siの後の「未来」は禁句

siの直後に未来形や条件法を使ってはいけません。必ず「Si + 半過去」の形を守りましょう。 "Si j'avais le choix, je resterais ici."
frontend.learn_grammar.from_rule: フランス語の仮定法:Si + 条件法 (Si + Imparfait) の使い方
🎯

魔法の3フレーズ

日常会話の9割は 'J'aurais dû' (すべきだった)、 'J'aurais pu' (できたはず)、 'J'aurais voulu' (したかった) でカバーできます! "J'aurais dû t'écouter."
frontend.learn_grammar.from_rule: フランス語の過去の後悔:「〜すればよかった」(Conditionnel Passé)
🎯

丁寧さの裏技

単に Je veux(〜が欲しい)と言うよりも、 "J'aurais voulu« を使うと角が立たず、ベルベットのような柔らかい響きになります。 »J'aurais voulu un café, s'il vous plaît."
frontend.learn_grammar.from_rule: 後悔を伝える:〜すべきだった(条件法過去)

重要な語彙 (5)

si if regret regret d'ici [time] by [time] aurai fini will have finished aurais su would have known

Real-World Preview

plane

Planning a Trip

Review Summary

  • Si + Présent, Présent/Futur
  • Si + Plus-que-parfait, Conditionnel Passé

よくある間違い

Never use conditional in the 'si' clause. The 'si' triggers the imparfait or plus-que-parfait.

Wrong: Si j'aurais su, je serais venu.
正解: Si j'avais su, je serais venu.

The 'si' clause cannot contain a future tense verb.

Wrong: Si il pleuvra, je ne sors pas.
正解: S'il pleut, je ne sors pas.

Use the auxiliary 'avoir' followed by the past participle of 'devoir' (dû).

Wrong: J'aurais devrais partir.
正解: J'aurais dû partir.

このチャプターのルール (6)

Next Steps

You've navigated some of the hardest grammar in French! Keep practicing these structures in your daily speaking.

Write a journal entry about a regret.

クイック練習 (10)

siの後の動詞を修正してください

Si je serais à Paris, je mangerais des croissants.

✓ Correct! ✗ Not quite. Correct answer: Si j'étais à Paris, je mangerais des croissants.
siの直後に条件法 (serais) を使うことはできません。半過去 (étais) を使う必要があります。

frontend.learn_grammar.from_rule: フランス語の仮定法:Si + 条件法 (Si + Imparfait) の使い方

カッコ内の動詞を条件法の適切な助動詞(avoir または être)で埋めてください。

Si j'avais su, j'___ (avoir) mangé plus tôt.

✓ Correct! ✗ Not quite. Correct answer: aurais
条件法過去を作るには、avoir か être の条件法現在を使います。je の場合は 'aurais' です。

frontend.learn_grammar.from_rule: フランス語の過去の後悔:「〜すればよかった」(Conditionnel Passé)

「彼女はもっと早く出発していただろう」の正しい訳を選んでください。

正しい翻訳を選んでください:

✓ Correct! ✗ Not quite. Correct answer: Elle serait partie plus tôt.
partir は助動詞に être を使い、主語が女性 (Elle) なので過去分詞の語尾に 'e' が必要です。

frontend.learn_grammar.from_rule: 後悔を伝える:〜すべきだった(条件法過去)

空欄に適切な条件法過去の形を入れてください。

Si j'avais eu le temps, je (venir) ___ chez toi.

✓ Correct! ✗ Not quite. Correct answer: serais venu
動詞 'venir' は移動を表す動詞なので、条件法過去では助動詞に 'être' を使います。

frontend.learn_grammar.from_rule: フランス語の過去条件法:もし〜だったら(Si節の用法)

文法的に正しい文はどれですか?

正しい仮定の文を選んでください:

✓ Correct! ✗ Not quite. Correct answer: Si j'étais fatigué, je dormirais.
ルールは「Si + 半過去」(j'étais) +「条件法」(dormirais) です。

frontend.learn_grammar.from_rule: フランス語の仮定法:Si + 条件法 (Si + Imparfait) の使い方

「私は勉強すべきだった」という意味になるように、空欄を埋めてください。

J'___ étudier pour l'examen.

✓ Correct! ✗ Not quite. Correct answer: aurais dû
「〜すべきだった」は、avoir の条件法 (aurais) + devoir の過去分詞 (dû) で表します。

frontend.learn_grammar.from_rule: 後悔を伝える:〜すべきだった(条件法過去)

空欄に適切な前未来の形を入れてください。

Dès que nous (avoir) ___ fini, nous irons au ciné.

✓ Correct! ✗ Not quite. Correct answer: aurons
主語が 'nous' なので、助動詞 'avoir' の未来形は 'aurons' になります。

frontend.learn_grammar.from_rule: フランス語の未来完了:「完了」を表す時制 (Le futur antérieur)

空欄に適切な条件法の形を入れてください

Si j'avais {un|m} chat, je l'___ (appeler) Minou.

✓ Correct! ✗ Not quite. Correct answer: appellerais
「Si + 半過去」(j'avais) の後は、条件法 (appellerais) を使う必要があります。

frontend.learn_grammar.from_rule: フランス語の仮定法:Si + 条件法 (Si + Imparfait) の使い方

過去の出来事に対する「推測」として正しい文はどれですか?

友達が遅れています。あなたなら何と言いますか?

✓ Correct! ✗ Not quite. Correct answer: Il aura oublié son sac.
前未来(futur antérieur)を使うことで、過去の出来事に対する可能性や推測を表現できます。

frontend.learn_grammar.from_rule: フランス語の未来完了:「完了」を表す時制 (Le futur antérieur)

文の間違いを見つけて直してください。

Find and fix the mistake:

Si tu avais mangé, tu n'aurais pas faim maintenant.

✓ Correct! ✗ Not quite. Correct answer: Si tu avais mangé, tu n'aurais pas eu faim.
過去の仮定(第3仮定法)を維持するには、結果の部分も過去の出来事として「n'aurais pas eu faim(お腹が空かなかっただろうに)」とするのが適切です。

frontend.learn_grammar.from_rule: フランス語の過去条件法:もし〜だったら(Si節の用法)

Score: /10

よくある質問 (6)

「si」が「〜かどうか」という意味の間接疑問文なら未来形もOKだよ。例えば 「
Je ne sais pas si elle viendra.
(彼女が来るかどうか分からない)」という感じだね。
フランス語では「si il」の響きより「s'il」の方が滑らかだと感じるんだ。「elle」の場合は「i」と「e」が続いても許容範囲だから、短縮しなくていいんだよ。
いいえ、絶対にダメです!フランス語ではsiの後は現在形か半過去です。 Si je gagneSi je gagnais と言いますが、 Si je gagnerai とは言いません。
現在形は「起こる可能性があること(現実的)」に使います。半過去は「可能性が低いこと、仮定、妄想(夢)」に使います。
もちろんです!文法自体は中上級ですが、 "J'aurais dû" というフレーズ自体を覚えておくと、ミスをした時にとても便利ですよ。
Je serais allé と言います。 aller は être を使うこと、そして女性なら allée と一致させるのを忘れずに。