has后面动词用什么形式,has是助动词吗后面要跟动词原形吗

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has后面动词用什么形式,has是助动词吗后面要跟动词原形吗(1)

动词形式用过去分词或to do形式,举例如下:

she has finished the work for five days.

he has to pay for what he did.

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