Je me demande si les phrases ci-dessous sont équivalentes et si on peut les utiliser de façon interchangeable ?
- Il nous faut partir.
- Nous devons partir.
- Il faut que nous partions.
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To be honest turn of phrase number 1 is very literary although grammatically impeccabble. If you say it in a spoken conversation people maybe surprised or think you are quoting an author.
In really colloquial normal French, we don't say "partir" as often as "y aller" (strangely the destination doesn't matter):
"Nous devons partir" or Il faut que nous partions", which is completely correct formal French, becomes in ordinary conversation:
We use "on" as a substitute for "nous" all the time. Because it's easier, faster and quicker. Lazy again...