Who _____ your parents talking to 为什么是is 不能是are?

Who _____ your parents talking to 为什么是is 不能是are? 为什么What is your parents' job?中的parent是复数却不用are而用is? Who is she talking _____? Who are they talking to?to什么时候加?为什么加? Who is the man___is talking to your mother? 是What about your parents.还是What are your parents who were you talking to at the party?为什么要用talking?这不是过去式么,应该 The man who is talking to your mother over there is your tea who is the man to () Rachel is talking?括号内可以填上什么词,是who,whom, are,Lise,talking,to,who,TIM,and? whose parents -----Ms Black talking to ?横线上添is还是are ? talking to your parents about your opinions instead of yelli