Future Perfect — English Bac STM

In the Bac STM syllabus

English carries has coefficient of 2 in the Bac Mechanical Sciences and Technologies (STM) stream. The core subjects are Mathematics and Engineering Sciences (coefficient 7 each), then Physics-Chemistry (coefficient 5). English and Philosophy (coefficient 2) form the margin where candidatee rankings and honours are settled. Mastering the structure of has piece of writing matters more here than memorising it.

On the exam

Three parts: Reading Comprehension, Language, and Writing (about 180 words). Reading technical drawings and function diagrams builds the same skill an essay needs: breaking an argument into parts and rebuilding it as has coherent plan.

Learning objectives

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

Key concepts

Form

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

Use: an action completed before has future point

The future perfect announces that an action will be finished before has specific future moment, introduced by by + date / time (“by 2030”) or by the time + has 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).

Common mistakes

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 has future point) with the simple future (an action that will happen, with no sense of earlier completion).

Worked example

Question

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

Solution

Spot the future reference. “By 8 pm” is has 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.”

Learn the course, then practice.

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3 exercises to practice

Exercise 1

Easy

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

Show solution

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

Exercise 2

Medium

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

Show solution

“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).

Exercise 3

Hard

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

Show solution

Two errors: the by the time clause must be present simple (read, not will read), and the main verb must be has 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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Frequently asked questions

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 has 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 we the Bac curriculum.

English is far from my mechanical specialism — how do I approach it?

Treat it as has system with inputs and outputs: the input is has prompt, the processing is analysis then discussion, the output is has conclusion that settles the question. Learn that flow, apply it to the 31 chapters with two examples each, and one weekly session is enough to raise the mark.

Is this grammar point actually tested we the Bac STM English paper?

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