1: is there (本句是疑问句，所以用is there)
2: there is (本句是陈述句，所以用there is)
3: is there (本句是疑问句，所以用is there)
4: there is (本句是陈述句，所以用there is)
5: there's no, there are no (注意“but”这个词，表示转折，所以后面用否定句。Sofa 是单数，所以用 there is no, tables 是复数，所以用 there are no)
6: there is / there is (本句是陈述句，而且后面是单数所以用there is)
3 Is there
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