Future Perfect — English Bac SMB

Dans le programme du Bac SMB

English carries a coefficient of 2 in the Bac Sciences Maths B (SMB) stream, level with Philosophy. Mathematics dominates the stream (coefficient 9), followed by Physics-Chemistry and Engineering Sciences (coefficient 7 each), so English can look marginal — but it and Philosophy form the narrow margin where rankings and honours are actually decided. Reading, language and guided writing are all assessed.

À l'épreuve

Three parts: Reading Comprehension, Language, and Writing (a guided text of about 180 words). SMB candidates, trained to be rigorous and systematic, do well on the Language section if they treat each grammar point as a rule with a fixed structure; the risk is a dry essay that ignores vocabulary range and register, which the Writing section also scores.

Objectifs d'apprentissage

Apply this grammar point accurately in the Language section and in the guided writing of the Bac SMB English exam (coefficient 2)
Form the future perfect: will have + past participle; negative won't have
Identify a precise future reference point (by + date / time, by the time + present)
Distinguish the future perfect (an action completed before a future point) from the simple future (a future action with no earlier reference)
Use the present simple, never will, in the clause introduced by by the time

Notions clés

Form

will have + past participle. Negative: won't have + past participle. Question: Will + subject + have + past participle?

Use: an action completed before a future point

The future perfect announces that an action will be finished before a specific future moment, introduced by by + date / time (“by 2030”) or by the time + a present-tense clause (“by the time you arrive”).

The by the time clause trap

In the clause introduced by by the time, use the present simple, never will, even though the meaning is future — as in all English time clauses (if, when, before, after, as soon as).

Erreurs fréquentes

Forgetting have after will: “will finished” is wrong — use “will have finished”.

Using will in the by the time clause: use the present simple (“by the time the guests arrive”, not “will arrive”).

Confusing the future perfect (an action completed before a future point) with the simple future (an action that will happen, with no sense of earlier completion).

Exemple corrigé

Énoncé

Put the verb in brackets into the right tense: “By 8 pm, we (finish) dinner.”

Correction

Spot the future reference. “By 8 pm” is a precise future moment before which an action must be complete.

Choose the tense. This is the typical future perfect structure: will have + past participle.

Result. “By 8 pm, we will have finished dinner.”

Le cours, puis l'entraînement.

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3 exercices pour t'entraîner

Exercice 1

Easy

Complete: “By next year, she (graduate) from university.”

Voir la correction

“will have graduated” — an action completed before a future point (next year).

Exercice 2

Medium

Rewrite with by the time: “The train leaves at 6 pm. I will arrive at 6:15 pm.”

Voir la correction

“By the time I arrive, the train will have left.” — the train leaving comes before my future arrival; the by the time clause is in the present simple (arrive), the main clause in the future perfect (will have left).

Exercice 3

Hard

Correct: “By the time you will read this letter, I will have leave the country.”

Voir la correction

Two errors: the by the time clause must be present simple (read, not will read), and the main verb must be a past participle (will have LEFT, not leave). Corrected: “By the time you read this letter, I will have left the country.”

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Questions fréquentes

Is the future perfect common in the national exam?

Less common than the past perfect or the passive, but it appears regularly in the Language section's tense exercises, usually paired with by or by the time to test recognition of the future reference point.

Can I use will in a time clause?

No, never: after if, when, before, after, as soon as and by the time, use the present simple even for future meaning. Will stays in the main clause.

What is the difference between future perfect simple and continuous?

The future perfect simple (will have + past participle) stresses the completed result; the future perfect continuous (will have been + verb-ing) would stress the duration up to the future point. Only the simple is on the Bac programme.

A maths-stream student often dislikes English — how do they raise the mark?

Treat it as structure. Every writing task = introduction + argument + counter-argument + conclusion; every grammar point = one rule + one correct example + one typical mistake. Memorise that framework, apply it to the 31 chapters with two example sentences each, and 12/20 is reachable without eating into the heavy maths programme.

Is this grammar point actually tested on the Bac SMB English paper?

Yes — in the Language section as gap-fill, sentence-joining or error-correction, and indirectly in Writing, where the same structures decide whether a sentence is marked as accurate. One rule, two examples and one typical mistake per point is enough to cover both.