why did it have to happen?中为什么要写did?直接写why it have to happen

why did it have to happen?中为什么要写did?直接写why it have to happen why did it have to happen.why did it all have to end.when i why did the earthquake happen? Why did you have to sit the game out?句中have 为什么用have to --Why did he have to leave school? where did it happen?译成汉语 is it this shopkeeper's dog? why do why did you keep it a secret from us?we ought to have been t Why English is everywhere?Why did this happen? it happen to What is inflation? Why does it happen? where did it happen?怎麼回答? What happened to you与how did it happen?的用法