Are these our pens和Is this our pen.用哪个?our应该用are还是is

Are these our pens和Is this our pen.用哪个?our应该用are还是is These are our pens .They are（）. this is our pen---------------- Our pens are alike=my pen __ __yours 自学英语问题This is my friend.用复数形式改写这个句子,后变为:These are our friend 用be(is,am,are)的适当的形式填空.1.This( )my mother.2.These( )our book 用代词的适当形式填空whose pens are these?they are ___(we)our eyes are this is david and this is tim.() are our Are these your pens?No,they're not.our pens are blue. Our school加上句型This is.There is .There are. whose pens are these?还是whose are these pen?区别? the singer and dancer(is,are)come to our shool.应该选哪个啊?