why did 和 why was/were 怎么区分?

why did 和 why was/were 怎么区分? why did 和 why were/was 怎么区分 were和was怎么区分? why were you do that 和why are you did that ,这两句话有错吗? 怎么区分什么时用候did;什么时用候was/were? why did you come so late?the bus was crowed.we were kept for why _______ you absent yesterday?a.did b.were c.was 为什么要选B,而 what/where/when/why/how/whose用was/were/did造特殊疑问句 was/were did -ed 的用法区分 where when why which 和介词加which怎么区分 There were not anything in sight. were 还是was? why Why not 和Why don`t的区分