Question 1

Why does Il faut translate to "You must" instead of "He must"?

Accepted Answer

Il faut is an impersonal expression. The il doesn't mean "he" here; it is a placeholder subject like the "it" in "it is raining." It literally means "it is necessary." When translating to English, we usually express this general rule as "you must," "we must," or "one must."

Question 2

Why do we use the dictionary forms ralentir and être here?

Accepted Answer

When you want to say "it is necessary to do something," you always follow il faut with an infinitive (the unchanged, unconjugated form of a verb). Because there are two actions connected by et (and), both ralentir (to slow down) and être (to be) stay in the infinitive.

Question 3

Prudent is an adjective, so it usually has to match a noun. Since there is no specific person here, why is it masculine?

Accepted Answer

When making a general statement using an impersonal expression like il faut, French defaults to the masculine singular form for adjectives. So we use prudent rather than the feminine prudente or the plural prudents.

Question 4

If Il faut is general, what if I actually want to say "He must slow down"?

Accepted Answer

Because il faut is strictly impersonal, you can't easily use it to single out a specific person at this level. To say "he must," you would use the verb devoir (to have to / must) and say Il doit ralentir.

Il faut ralentir et être prudent.

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