you should be careful.为什么要加be而不直接是you should careful.

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youshouldbecareful.为什么要加be而不直接是youshouldcareful.youshouldbecareful.为什么要加be而不直接是youshouldcareful.yous

you should be careful.为什么要加be而不直接是you should careful.
you should be careful.为什么要加be而不直接是you should careful.

you should be careful.为什么要加be而不直接是you should careful.
careful 是形容词,组成一个句子 前面要加 be 动词.
如果没有should ,那么这个句子是 you are careful.
should 后面要加动词原形 即 be .
就变成 you should be careful.
不知我讲明白了吗?