it happened to be raining.还是it happened to rain.第一个是对的,第二个有吗?

It happened to be 和There happened to be有什么区别? 翻译:I happened to be at the station ,when it happened it happened to be raining.还是it happened to rain.第一个是对的,第二个有吗? When he got off the train,it happened----为什么用to be raining这个时态? 英语翻译It is missing head happened to be among remains of the fifth centuryB.C. It (so) happened that.什么时候加so?It (so) happened that.这个句型什么时候加so,什么时候不加so?另外：There happened to be nobody in the house on fire.中为什么开头用There 而不是It? the old man happened to be on It happened ( ) when I got off the bus in beijingA.to rain B.raining C.rained D.to be raining We he got off the bus,it happened ___?为什么空处是to be raining?而不是to rain There ( )nobody in the room.were just happened being were happened happened to be. Peter was happened to be at home that day.为什么是was happened而不是happened It happened to be rainy___the morning of the sports meet.用in还是用on呢?给出理由. it was a soldier who happened to be there___saved the girl from the danger.应该填that,为什么 高中语法小练习( ) happened to be a severe drought that year.A.It B.This C.There D.Then he ____ by his sister at that moment.A.happened to see B.was happened to see C.was happened to be seen D.happened to be seen --What _ to them?--they appeared__in the accident.A.has happened to,be injured B.happened ,to have been injuredC.has happened to ,be injured D.happened ,injured He persuaded the dealer to open the box in which it happened to be.这句话box后面的in是什么用法还有happened to 后面为什么用be ,翻译一下这句话, He persuaded the dealer to open the box in which it happened to be.这句话box后面的in是什么用法还有happened to 后面为什么用be ,翻译一下这句话,