There is a pen and three apples on the desk.为什么用is不用are?

There is a pen and a pencil 还是There are a pen and a pencil This is a pen,and ____is a pencil over there there _ a pen and abook A.is B.are There is ( ) “P,( )“E”and ( )N in pen.(a/an) There is a little ink in his pen and little ink in her pen.Whose pen do you borrow? There is a pen and 2 pencils in the pencil-box.(就a pen and 2 pencils 提问） 3、 There is a pen in your hand isn’t there? 3、 There is a pen in your hand isn’t there? there two pencils,a pen,a rubber and a knife in it.And there is a long ruler here __ a pen and two books to for you.A.is B.are C.have ___any milk in the room?A.Is there B.Are there C.There isn't 选取那个,为什么其它不行, There ___ a pen and two pencils on the desk.用is还是are~There ___ a pen and two pencils on the desk.用is还是are~ is there a pen and some books on the desk?肯定回答是yes,there is 还是yes there are There is a pen and three apples on the desk.为什么用is不用are? there is a pen and some rubbers on the table.这里应该用is还是are? there is a pen 对a 提问 There is a book and a pen on the table改为复数句 There is a book and a pen on the desk.(变为否定句) What ________in my pencil-box?There is a pencil,a pen and an easer in it.