what is he doing now 为什么这里要用IS而不用DOES呢?不是说第三人称单数要用DOES么?到底什么时候用DOES

what does he do now 与what is he doing now?有何区别? What is he doing? What is he doing What is he doing? What does he do now?与 What is he doing 一样? what is he doing not now?he is telling (goke)to us do you suppose he is doing now /what do you suppose he is doing now?这两个都对吗/前者可以看成是宾语从句吗?do you suppose what he is doing now?这个句子对不？ tall thin tom is and boy a,now doing what is he,连词成句 My watch is broken .Can you r_p_ir it?Can you _m_g_ne what he is doing now? what is he doing ------he is p______b_______. what is your mother doing now? What is john doing now?怎么答 what is you doing now修改病句 what (is are )you (do doing ) now 选择填空He is going to buy a birthday cake.A.What is he going to do?B.What is he doing now?我选择A对吗？ 宾语从句句子成分问题I wonder what he is doing now 问下WHAT在从句中做什么成分 what （ ） he （ ）now A.is,do b.is,doing c.does,does d.do,does what.is.he.doing的中文是什么意思