1. Phrase. you shouldn't have (said on receiving a gift)
Analysis
il
1. pron. he (third-person singular masculine subject pronoun for human subject)
Il est parti. - He left.
2. pron. it (third-person singular subject pronoun for grammatically masculine objects)
Je cherche mon livre. Où est-il ? - I'm looking for my book. Where is it?
3. pron. (impersonal pronoun) Impersonal subject; it
ne
1. part. (literary) not (used alone to negate a verb; now chiefly with only a few particular verbs: see usage notes)
2. part. not, no (used before a verb, with a coordinating negative element usually following; see Usage Notes, below)
3. part. (Used in a subordinate clause before a subjunctive verb (especially when the main verb expresses doubt or fear), to provide extra overtones of doubt or uncertainty (but not negating its verb); the so-
4. part. In comparative clauses usually translated with the positive sense of the subsequent negative
Apprendre le français est plus facile qu'on ne pense. - Learning French is easier than you (might) think.
fallait
1. v. third-person singular imperfect indicative of falloir
falloir
1. v. (impersonal) to need, have to, to be necessary (that)
Il faut que j'y aille - I need to go.
Faut que j'y aille. - Got to go.
Il ne faut pas que tu dises ça. - You don’t have to say that.
Il a tout ce qu'il te faut. - He has everything that you need.
pas
1. n-m. step, pace, footstep
2. n-m. (geography) strait, pass
Pas de Calais - Strait of Dover
3. n-m. thread, pitch (of a screw or nut)
4. adv. The most common adverb of negation in French, typically translating into English as not, don't, doesn't, etc.