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 ☺☺☺