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1·We'd better not be seen together. People will talk.

我们最好不要被人看见在一起。人们会议论。《柯林斯英汉双解大词典》

2·You'd better not go to crowded places.

你最好不要去人多的地方。

3·You'd better not take off your coat.

你最好不要脱掉你的外套。

4·You'd better not, for I've got a cold.

你最好不要，因为我感冒了。

5·You'd better not stay out late with your friends.

你最好不要和朋友在外面待得太晚。

6·You'd better not look at your phone while walking.

你走路时最好不要看手机。

7·Do you mind my smoking here? You'd better not.

你介意我在这儿抽烟吗？你最好不要。

8·You had better not go to visit him on weekdays.

你最好不要在工作日去看他。

9·You'd better not tell your mother or anyone else about it.

你最好不要把这件事告诉你妈妈或其他人。

10·You'd better not hang out after school without telling your parents.

放学后，你最好不要不告诉父母就出去玩。