there is there are 一般现在时肯定形式
there was there were 一般过去时肯定形式
there isn't there aren't 一般现在时否定形式
there wasn't there weren't 一般过去时否定形式
希望能采纳！
there is a cat.
there isn't a cat.
is there s cat?
isn't there a cat?
首字母要大写
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