there is adesk and two beds in the room为什么用IS而不用HAS或ARE

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thereisadeskandtwobedsintheroom为什么用IS而不用HAS或AREthereisadeskandtwobedsintheroom为什么用IS而不用HAS或AREtherei

there is adesk and two beds in the room为什么用IS而不用HAS或ARE
there is adesk and two beds in the room
为什么用IS而不用HAS或ARE

there is adesk and two beds in the room为什么用IS而不用HAS或ARE
there be句型适用"就近"原则,BE单复数决定于BE后而接的词是单数还是复数,
there is a desk and two beds in the room.
a desk,所以要用单数,即IS
there are two beds and a desk in the room.
two beds,所以要用复数,即ARE..

这是there be 句型,所以不用has或者have
根据就近原则,be动词后面是a desk,单数,所以用is

这是主谓一致的问题,就近原则.

定语从句啊 That /There is/are...
不用are的原因是desk在前面所以用is