是不是There is a pen and a pencil但是是These are a pen and a penci

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是不是There is a pen and a pencil但是是These are a pen and a pencil?
有很多时候分不清是用is还是are,什么时候用哪一个大家能不能告诉我一下

应该是There is a pen and a pencil,因为there be 是由就近原则的.
比如There is a book and two pens.
There are two pens and a book.
there be 的be 是单数还是复数形式取决于后面紧跟的单词是单数还是复数, be动词要随着句子中离它较近的名词单复数变化而变化,通常叫它的就近原则.

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