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Are you still looking for it?：为什么they后面用don'tthey后面的动词需要加s吗they后面加动词原形吗为什么they前面用dothey后面为什么要加arethey 后面为什么用havethey后面的动词要+s吗they后面的动词加s吗they后面动词加s的情况they后面跟动词原形吗?
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