lucy with her friends is form japan中为什么用is而不是用are

lucy with her friends is form japan中为什么用is而不是用are 为什么Lucy with her friends is(be)from Jpan用is而不用are? Nancy with her friends 后面为什么要加is而不是are lucy with her friends is from Tom with his friends （ is ） playing soccer.为什么是is而不是are? lucy with kitty is not good at English,为什么用is not,不是are not 为什么要用is而不是are? Is cindy playing volleyball with her friends?yes,they are. Is her hobby___(chat)with her friends Paul is friends with Bill.为什么系动词用is the number of the workers here is about 50.句中为什么用is而不是are? Lucy is doing shopping with her mother 提问Lucy