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 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)