Infinitive or Gerund — English Bac STM

Dans le programme du Bac STM

English carries a coefficient of 2 in the Bac Sciences et Technologies Mécaniques (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 candidate rankings and honours are settled. Mastering the structure of a piece of writing matters more here than memorising it.

À l'épreuve

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 a coherent plan.

Objectifs d'apprentissage

Apply this grammar point accurately in the Language section and in the guided writing of the Bac STM English exam (coefficient 2)
Recognise verbs always followed by the gerund (enjoy, avoid, finish, mind, suggest, consider, risk, admit, deny)
Recognise verbs always followed by the to-infinitive (want, decide, hope, plan, promise, agree, refuse, manage, afford)
Distinguish the meaning of stop to do / stop doing and remember to do / remember doing
Apply the rule: every preposition is followed by the gerund, never the infinitive

Notions clés

Verbs followed by the gerund (-ing)

enjoy, avoid, finish, mind, suggest, consider, risk, admit, deny, keep (on), imagine + verb-ing. E.g. “I enjoy swimming.”, “She suggested going to the cinema.”

Verbs followed by the to-infinitive

want, decide, hope, plan, promise, agree, refuse, manage, afford, seem + to + base form. E.g. “He decided to leave.”, “They agreed to help.”

Dual-construction verbs, different meaning

stop to do (stop in order to do something) vs stop doing (give up a habit); remember to do (not forget to do it, before the action) vs remember doing (recall having done it, after the action); try to do (make an effort to succeed) vs try doing (experiment with a solution).

Erreurs fréquentes

Putting to after enjoy / avoid / finish / suggest: “I enjoy to swim” is wrong — use “I enjoy swimming”.

Confusing stop to do and stop doing: “He stopped to smoke” means he stopped (walking, for example) in order to smoke, not that he gave up smoking (stop smoking).

Forgetting that prepositions are always followed by the gerund: “interested in to learn” is wrong — use “interested in learning”.

Exemple corrigé

Énoncé

Correct and justify: “She suggested to go to the cinema. He stopped smoke last year.”

Correction

suggested to go. Suggest is followed by the gerund, never by to + infinitive: “She suggested going to the cinema.”

stopped smoke. The intended meaning is “he gave up smoking” (a habit): use the gerund, “He stopped smoking last year.” (stop to smoke would mean he paused what he was doing in order to smoke a cigarette).

Corrected sentence. “She suggested going to the cinema. He stopped smoking last year.”

Le cours, puis l'entraînement.

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3 exercices pour t'entraîner

Exercice 1

Easy

Choose the right form: “I look forward to (see / seeing) you soon.”

Voir la correction

seeing — in look forward to, “to” is a preposition here (not the infinitive marker), so it is followed by the gerund: “I look forward to seeing you soon.”

Exercice 2

Medium

Complete with the correct form of close: “I clearly remember ___ (close) the window before leaving.” (the memory is of an action already done)

Voir la correction

closing — remember + gerund describes recalling an action already done: “I clearly remember closing the window before leaving.” (remember + to + infinitive would mean “not to forget to close”, a future action).

Exercice 3

Hard

Correct: “He denied to steal the money, but he admitted to lie about it later.”

Voir la correction

Deny and admit are followed by the gerund, never by to + infinitive: “He denied stealing the money, but he admitted lying about it later.”

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Questions fréquentes

How do I know whether a verb takes the gerund or the infinitive?

There is no general rule: it is a list to learn verb by verb (enjoy / avoid / finish / suggest → gerund; want / decide / hope / promise → infinitive). Learning the lists in meaning groups makes them easier to remember.

What comes after a preposition (in, at, about, for)?

Always the gerund, never the infinitive: “She is interested in learning French.”, “He apologised for being late.” This rule has no exceptions.

stop to do and stop doing — how do I tell them apart in the exam?

stop doing = give up an action or habit (the more frequent meaning). stop to do = pause (from doing something) in order to do something else: “He stopped to answer the phone” means he stopped (walking, working…) in order to answer.

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

Treat it as a system with inputs and outputs: the input is a prompt, the processing is analysis then discussion, the output is a 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 on the Bac STM 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.