what has happen 和what was happen 和what happen有什么区别,它们后面都能加to吗?

what has happen 和what was happen 和what happen有什么区别,它们后面都能加to吗? there are many people there,___?a.what was happened b.wha happens c.what has happenedd.what happened What happen what happen what happened 和what did happen的区别 what happen和what happened有什么区别 I can't go to school today,Mum?Why_______,dearA,Wha's happed to ypu B.What did you happen C.What was wrong with you D.What's the matter with you What do you think ____ (happen)?A to happen B happening C is happened D has happened What happen还是What is happen? What _______(happen) here?There is blood on the floor.这里happen为舍要搭配has,直接填happen不行吗? What do you suppose has happen to her?能转换成Do you suppose what has happened to her? what do that happen 和 how do that happen 的区别! what do you suppose _______to him?为什么是has happened不是to happen? what's ____on monday?A.happen B.happened C.happening D.has happened 理由? no one seems to know what has happen in the paek同义句转换 what will happen? What happen to What's happen?