Dont后接动词原形，如果是系表结构,就接be，如：Dont be late again。

dont是do not 的常用口语形式

扩展资料

Don't be so mean to your little brother!

别对你弟弟那么刻薄！

Don't be so ready to believe the worst about people.

不要总把人往坏处想。

Don't be so heavy on her ─ it wasn't her fault.

别对她这么苛刻——这不是她的过错。

Don't be discouraged by the first failure ─ try again!

不要因第一次失败就灰心丧气——再试一次吧！

Don't be too proud to ask for help.

不要放不下自尊而不求人帮忙。