be careful的否定是 do not be careful还是not be careful?
be careful的否定是 do not be careful还是not be careful?例句:If you are not careful,you will make the same mistake 那么它的否定是什么? Please be careful.的否定呢?
be careful是祈使句的否定是 do not be careful 例句里是陈述语气,所以be动词后面加not Please be careful也是祈使句,否定是please don't be careful