Bonjour
Present perfect =
have au présent (have/has) + participe passé du verbe
a- A lot of people have taken up the challenge
b- They have supported the cause successfully.
tu peux mettre "successfully " entre have et supported
c- The headmaster has washed the teachers' car in the car park !
d-We have donated ¨£125 for four charities and we have enjoyed the experience.
est-ce qu'il manque une phrase ==> to act ???
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bonne journée
