what did it happend什么意思

when did it happen和 when has it happend?有什么区别 did you know _______?A what they happend?B what happend to t what happend sister什麼意思? what happend? what happend don't cry because it is over ,smile because it happend什么意思 what happend是什么意思 What did Jack do in the race and what did he think of it的意思 what's wrong?what's up?what's happend?what's the matter?有什么区 what did he do with it,和what did he do 有什么区别呢? what用法What did you say和what say did you 有什么区别?What day is it what‘s happend 还是 what’s the happend