Nancy with her friends 后面为什么要加is而不是are

Nancy with her friends 后面为什么要加is而不是are lucy with her friends is form japan中为什么用is而不是用are Tom with his friends （ is ） playing soccer.为什么是is而不是are? 为什么Lucy with her friends is(be)from Jpan用is而不用are? Is cindy playing volleyball with her friends?yes,they are. nancy with her sister( )going hiking.括号中的be动词是用is还是are she's had trouble with her husband.为什么is后面可以加had Amy was never friends with her mother.既然用was为什么后面用friends? Is her hobby___(chat)with her friends make friends with的friends,为什么要加s? she is there with her friends 对her friends提问 为什么some broccoli is on the table 要加is而不是are