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.

是不是There is a pen and a pencil但是是These are a pen and a penci This is a pencil and a pen还是These are a pencil and a pen There is a pen and a pencil 还是There are a pen and a pencil This is a pencil and a pen还是This are a pencil and a pen, This is a pen,and ____is a pencil over there There is a pen and 2 pencils in the pencil-box.(就a pen and 2 What ________in my pencil-box?There is a pencil,a pen and an there is a pen and two books on the desk.还是there are a pen a there _ a pen and abook A.is B.are This is a pen and ____ is a pencil. there be 句型就近原则,there is a pencil and a pen,which were made There are some books,a pen and a pencil on the table,_______