因为前面是aren't,也就是are not的缩略式,整个句子是一个现在进行时.现在进行时的构成为is/are (not)+动词的ING,表示说话时动作正在进行,所以后面的动词不变.
为什么在 They aren`t performing lion and dragon dances 这个否定句中动词不
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and可以用在否定句中吗比如:You can't wear a T-shirt and shorts.为什么不用or