he walk over to see what happened...什么时候用what is happen 什么时候

he walk over to see what happened...什么时候用what is happen 什么时候 what happened/what was happened/what is happened/what happen what happen to you还是what happened to you? what happen to sb 还是 what happened to sb 英语中什么时候用what 什么时候用what is 英语中,什么时候用what ,什么时候用what is What happened in that class probably reflects what is happen what happened to him yesterday.为什么要用happened?happen可以吗 He is looking for to see what is happening over there.这里的“se happen用法what's happened to you What's happened toyou what ha What to him last week?A.did happen B.is happing C.happened D He is wondering what happened to the old