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The verb falloir is only ever used in the third person singular impersonal expression Il faut.
You will NEVER see je faux or nous fallons for example!
Depending on context, it can express either necessity or obligation.
Learn how to use 'il faut' in French
1-
When you use il faut, you are talking about a general rule, or a general statement that applies to people.
Look at these examples:
Indeed, it can mean you must (in general), we (people) must or one must OR you need (in general), we (people) need or one needs.
Il faut can be followed by a verb in the infinitive or a noun:
- Il faut + infinitive = to need to [do something] OR must / to have to [do something]
- Il faut + noun = to need [something]
Note that when using the general il faut, the possessive pronoun will be son, sa, ses as it is quite similar to saying One must...
2-
You can also use il faut in a personal way, to state things that a specific person has to do or needs (to do), but the structure changes slightly.
Look at these examples:
Note that to use il faut for specific people, you need to use an indirect object pronoun (me, te, lui, nous, vous, leur), as such:
- Il [pronoun] faut + noun = to need [something]
(Literally, it needs to me/ to him / to them OR it must to me/ to him/ to them)
- Il [pronoun] faut + infinitive = to need to [do something] OR must / to have to [do something]
Note that the latter structure sounds very formal in French! In everyday language, you would usually use one of the alternatives listed below.
ATTENTION:
-> In the first case, you refers to a specific person, therefore you need to use the possessive ta, whereas in the second case, you refers to people in general, and you'll use the impersonal possessive sa.
And see also other ways to express necessity or obligation:
Avoir besoin de = To need (French Expressions with avoir)
Conjugate devoir in the present tense in French (Le Présent)
and the more advanced usage of il faut:
Il faut que + the subjunctive mood (Le Subjonctif) in French
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Examples and resources
They need to leave this place.
She needs some help.
