问题补充:
Those students are doing their homework,but we dont.哪里错?
答案:
we dont 改成 we arent
因为前面的动词是are doing,所以系动词要一致!
不懂继续问======以下答案可供参考======
供参考答案1:
don ---aren
供参考答案2:
don 变为aren 。这应该用be动词,而不是助动词
供参考答案3:
Those students are doing their homework,but we are .
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