所指事物单数用is,复数用are,中文的话我给你举个例子吧，
那里有一个女孩，There is a girl
那里有很多树木，There are many trees
is 用于可数名词的单数或不可数名词。
are用于可数名词的复数。
There is some milk on the desk.
There is an apple on the tree.
There are many books on the desk .
There be 句型里的be跟后面的名词的数一致。如： There is a table in the room.
There are many desks in the classroom.
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