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1·His bad behaviour was just an isolated incident.

他的不良行为只是个别事件。《牛津词典》

2·Apparently the boy had a longstanding reputation for bad behaviour and his mum for even worse behaviour if he was challenged.

很显然，这个男孩恶行多端的臭名流传已久，他妈妈亦是如此，如果儿子受到质疑，妈妈的行为会更恶劣。

3·Three children were removed from the school for persistent bad behaviour.

三个孩子因持续行为不检被学校开除。《牛津词典》

4·One should not let bad behaviour go unchecked.

对错误的行为， 不能放任不管。《新英汉大辞典》

5·His bad behaviour rewards attention.

他的恶劣行为值得注意。

6·Bad behaviour is not the only problem.

恶意行为还不是唯一的问题。

7·The bad behaviour deserves a spanking.

这样的坏行为真应该揍。

8·He is blind to his son's bad behaviour.

他对他儿子的坏行为视而不见。

9·Chelsea is not a team with bad behaviour.

切尔西不是一支行为恶劣的球队。

10·She corrected her son for his bad behaviour.

她严厉斥责了她儿子的坏行为。