Bonjour
tu ne précises pas s'il faut mettre à un temps du présent ou passé..
Cooks in England are influenced by both cultures.
présent, qui est le temps qui me semble approprié d'après le sens....
------------------- were influenced ----------
prétérit simple .. au cas où...
The road signs are written in English and Chinese and both languages are spoken by the citizens.
présent simple, même chose, le temps qui me semble approprié
--------- were written ---------------- ------were spoken
prétérit simple ...au cas où
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pour conjuguer un verbe à la voix passive, il faut conjuguer BE au temps voulu et ajouter le participe passé du verbe.
Paul eats a cake. > a cake is eaten by Paul.
Paul is eating a cake > a cake is being eaten by Paul
Paul ate a cake > A cake was eaten by Paul.
Paul was eating a cake > a cake was being eaten by Paul
Paul will eat a cake > a cake will be eaten by Paul
Paul has eaten a cake > A cake has been eaten by Paul
etc....
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bonne journée ☺☺☺