He should polite and helpful 哪里错?

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He should polite and helpful 哪里错?
He should polite and helpful 哪里错?

He should polite and helpful 哪里错?
He should be polite and helpful .他应该有礼貌并且乐于助人.He should polite and helpful 中没有系动词,而should是情态动词,不能在句中单独做成分.根据 情态动词+动词原形 ,故应在should 后加系动词 be .

He should be polite and helpful

should be

polite and helpful 是形容词,前面应该有动词.should 后面一般是动词原型be,所以这句话正确应该是
He should be polite and helful

He should be polite and helpful. (少了个be)