isn't是单数, aren't是复数, don't是动词第一人称,第二人称,复数, doesn't是第三人称单数 再问: 动词第一人称怎么用? 再答: 比如说I don't like this cat.(我不喜欢这只猫) 再问: you aren't like this cat 不对了 是不?为什么? 再答: aren't不是动词否定词,应该是you don't like this cat. 再问: 系动词和助动词的区别?那到底aren't是系动词还是don,t是系动词? 再答: aren't是系动词, don't是助动词 再问: 明白了,谢谢