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1·You'll have to be careful how you behave yourself, though.

不过，你得注意自己的举止。

2·Mind and behave yourself and don't be any trouble.

注意点，规矩点，别惹麻烦。

3·If you don't know how to behave yourself at table in a foreign country, you should copy the host.

如果你在国外吃饭不懂餐桌礼仪，你应该照主人的样子去做。

4·Behave yourself and keep quiet for a while.

规矩点，安安静静地待着！《新英汉大辞典》

5·Beware how you behave yourself.

你要注意放规矩点。

6·He hopes you'll behave yourself.

他希望你规矩点。

7·You must behave yourself in class.

在课堂上你必须约束好你自己。

8·Be good! Behave yourself.

表现好一些！

9·From now on, please behave yourself.

从现在起，请你好自为之。

10·You should behave yourself in public.

你应该在公众场合规范自己的举止。