Bonsoir
a- I'd better read or do some sports instead of watching TV.
b- Why don't you tell him the truth ?
c- I advise you not to stand by the window if you don't want to catch a cold.
d- John had better not come because he doesn't get on well with my friends.
e- He has practised so much this year that I think he ought to win this competition .
f- You shouldn't help him all the time with his homework because he may get used to it.
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bonne soirée ☺☺☺