Do和don't都可以加在谓语前表示强调,如：I do like this food.(我确实喜欢这个食物.)
Don't be也可以作强调句型,如祈使句：Don't be afraid.(不要害怕.)
总体来说,don't 来修饰的作用就是强调.
如：
don't be sad与not be sad意思没什么区别
don't be sad是祈使句,
若前面已有一个动词,则用not be sad
祈使句的否定用don't be
don't be和be not的区别,分别用在什么地方?祈使句的否定用don't be还是be not?
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