当做疑问句 Is there a bird on the desk?
回答有 Yes,there is.
回答是可以将回答补全 Yes,there is(a bird on the desk).
No,there isn't(a bird on the desk).
当做疑问句 Is there a bird on the desk?
回答有 Yes,there is.
回答是可以将回答补全 Yes,there is(a bird on the desk).
No,there isn't(a bird on the desk).