How to Conjugate the French Verb Grossir

Simple French Verb Conjugations to Say "Gained Weight"

woman on scale
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How would you say "to gain weight" in French? For this, we use the verb grossir, which can also mean "to become fat." That's easy enough, but in order to use it properly in sentences, the verb needs to be conjugated. This lesson will show you how to do so in the simplest and most common forms.

You might also be interested in studying the verb maigrir, meaning "to lose weight."

Conjugating the French Verb Grossir

When we want to say "gained weight" or "is gaining weight" in French, a verb conjugation is required.

Since grossir is a regular -IR verb, this is relatively easy, especially if you've already had a few conjugation lessons. That's because grossir follows a common pattern.

Any French conjugation begins by identifying the verb stem and for grossir, that is gross-. With that, we then add a new ending for each tense of the verb as well as each subject pronoun within the tense. For instance, "I am gaining weight" is "je grossis" while "we will become fat" is "nous grossirons."

It's actually quite simple and practicing these in context will help you memorize all the words.


The Present Participle of Grossir

When we add - issant to the verb stem of grossir, the present participle grossissant is formed.

It is used as a verb, adjective, gerund, or noun depending on the context.

The Past Participle and Passé Composé

To form the passé composé and express grossir in the past tense, the past participle grossi is required. This is preceded by the subject pronoun and the appropriate conjugate of avoir, an auxiliary verb.

For example, "I gained weight" is "j'ai grossi" and "we became fat" is "nous avons grossi."

More Simple Grossir Conjugations to Learn

In conversation, the subjunctive verb mood is used to imply that the verb's action is in some way uncertain. Similarly, if the action will only happen if something else does, then the conditional verb mood is used.

In literature, you will encounter the passé simple forms of grossir. This is also true of the imperfect subjunctive and it's a good idea to be able to recognize both of these.

SubjectSubjunctiveConditionalPassé SimpleImperfect Subjunctive

The one instance when the subject pronoun is not required is when the imperative form of grossir is used. The verb itself implies the who in these short sentences, so use "grossis" rather than "tu grossis."