an expert----- to help them tomrrow,they are sure to work ou

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an expert----- to help them tomrrow,they are sure to work out the problem

如果楼主没有打错题目,则正确答案是：to come
1.此题考查独立主格结构.
两部分之间用逗号隔开,但是却没有任何连词连接,且后句是一个完整的句子,这就说明逗号前面的部分不是一个句子,而只是后句的一个成分而已.
且前面的成分含有一个独立主语an expert,说明它是一个独立主格结构,此时必须选入动词的非谓语形式：不定式或现在分词或过去分词.
2.根据tomrrow及句意,come to help them该动作在当时尚未发生,所以选项必须填入不定式方可,所以正确答案只能是 to come.
3.现在分词或过去分词用在此题时,要求其所表示的动作都已经发生.
此时,如果前面的独立主语an expert和分词所表示动作之间为主动关系,则选用现在分词；
反之,如果前面的独立主语an expert和分词所表示动作之间为被动关系,则选用过去分词.

an expert----- to help them tomrrow,they are sure to work ou They are e_ you to help them with the work. We are sure they'll come to help us_______they are free.Boys they obviously needing somebody to help them. They are to help others. they can help to well keep them相当于they can help them to _wel an encouraging word to those who are down can help them out 3.An expert, together with some assistants, ____ to help in Yesterday we __ an expert to help solve this problem.A calle they are easy to take with them They are going to help the farmers with their work 是on the f They are going to help some f__ with their work in the field