Be care Be careful Be carefully

Question

有什么区别啊？
用正确的形式填空：Be-----(care).The road is very busy.

Answer 1

be动词后面只能跟形容词，所以careful
care是动词，carefully副词
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Answer 2

Be【careful 】.The road is very busy.

be 后跟形容词，所以填 careful

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Answer 3

careful，be是系动词，后面要加形容词做表语，其他两个词性都不能用在be动词之后

Answer 4

be careful
be动词+adj.