助动词后面的动词不一定都用原形。有的助动词后面用动词原形,有的助动词后面不用动词原形。
例句:
助动词后面用动词后面:
1.Tom doesn't like English.
在这个句子中,doesn't是助动词,后面跟的动词 like要用动词原形。
2.Mary didn't go shopping yestetday.
didn't 是助动词,后面跟的go要用动词原形。
助动词后面不用动词原形:
1.Mary is dancing.
is是助动词,后面不用动词原形,而是用现在分词 dancing.
2.He has finished his homework.
has是助动词,后面不用动词原形,而是用过去分词finished.
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