Friday, December 26, 2014

Etre ou avoir?

"Composed pasts" are made of two parts:
1) an auxiliary verb, conjugated according to the subject (the latter can be conjugated in the composed past, the verb will then be made of 3 words)
2) a participle, invariable in English

In English, the composed past is always used with "have" as the auxiliary. Using "to be" automatically changes the meaning to the passive form. 
(I am only describing auxiliaries in the past, not the English "be + -ing" that doesn't exists in French)
  • I have fooled my sister - I have been fooling my sister (Active voice)
  • I am fooled by my sister - I am being fooled (Passive voice)
In Frech, things are a little more complicated... Using the auxiliary "to be" will lead to the passive form, but some verbs are employed with "to be" in the active form as well!
  • J'ai mangé du fromage ensuite je suis parti. The first verb needs avoir, the second être.
  • Le chat a mangé la souris, la souris est mangée par le chat. Manger is used with the auxiliary avoir, using manger with être means you're in the passive voice!
  • Je me suis réveillé puis j'ai réveillé mon frère. Pronominal verbs always go with être, but the normal version with avoir.
There is a set of rules, or you can study them... The rules are well-explained here.
I think if you remember that the verbs that don't exists in the passive voice are conjugated with être (including pronominal verbs "se ..."), you're unlikely to make mistakes. 
I made up this rule, and I am not an expert in grammar, so let me know if you find exceptions!
A few more examples: 
  • become, devenir, doesn't exist in the passive voice -> être. Je suis devenu grand
  • se rappeler is a pronominal verb -> être. Il s'est rappelé de mon nom.
  • Venir: no passive form (you can't say "I am came") so être: tu es venu
  • Voir: the passive form exists, (you have seen (active) and you are seen (passive)) -> avoir. J'ai vu.
Yes, it is complicated, but you'll be understood* even if you use the wrong auxiliary! Keep learning :)

*exists in the passive voice -> comprendre goes with avoir! Tu as compris?

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