be动词由离它近的名词来决定 例如：
There are two pens and a pencil in my pencil box.
There is a pencil and two pens in my pencil box.
be的形式跟离它最近的词一致
there is an apple and three pears on the table.
there are three pears and an apple on the table.
there be 句型中的就近原则
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