Bonjour
a- No, mummy, I wasn't playing video games, I was doing my homework.
b- Alex and Jenny were in the garden when the postman came, they were gardening.
c- We weren't at his party last week, we were in London.
d- He wasn't very nice when he was a child, he was always arguing with his sister.
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Il faut surtout bien lire les phrases pour en comprendre le sens, et ensuite les affirmations ou négations se mettent en place facilement
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Bonne journée
