为什么是What happened?而不是 What did happen?不是用do来构成有行为动词动词的疑问句吗?还有是 what you happened?而不是 what did you happen?

I asked him what had happened 为什么要用had happened 而不直接用happened what/that has happened.为什么是选what?happen后面不是不加宾语嘛?为什么不是that啊! 谁能解释来一下为什么是what happened to you而不是what was happened to you? what do you suppose _______to him?为什么是has happened不是to happen? I have no idea what has happened to him为什么是同位语从句 What do you imagine----to her?为什么是has happened?这算什么时态? Do you know___?A.What happened to him :B.What is the matter with him 答案为什么是A? We haven't seen Jim for several days.What do you think has happened to him 为什么是has happened而不是will happen 为什么是What happened?而不是 What did happen?不是用do来构成有行为动词动词的疑问句吗?还有是 what you happened?而不是 what did you happen? Peter was happened to be at home that day.为什么是was happened而不是happened what has happened to the earth in the last ten years 为什么是完成时呢?讲细一点~ what was happened 为什么不能用what was happen 为什么是B而不选A What happened to the priceless works of art?为什么不能用“They were destroyed in the earthquakeWhat happened to the priceless works of art?为什么不能用“They were destroyed in the earthquake.”回答.而要用The earthquake destroyed 请问I am sorry to trouble you,sir的应对语为什么是What seems to be the problem?而不可以是What is wrong with you? What had happened?What had happened?What had happened? 是What happened 还是what’s happened what happened=what's happened吗?