happened to be,能与过去完成时和用吗?

It happened to be 和There happened to be有什么区别? 过去完成时能和瞬间动词连用吗 it happened to be raining.还是it happened to rain. there happened to be英语语法专家进 sth happened和sth be happened有什么区别? what happened with和what happened to用法上有区别吗? 英语中如何区分现在完成时和过去完成时?什么时候用现在完成时,什么时候用过去完成时?最好能举个例子 what happened to him yesterday.为什么要用happened?happen可以吗 用过去完成时怎么写there be 句型 He【 has gone to】谓语 Beijing 现在完成时和过去完成时的have 与 had都是助动词吧 There happened to be nobody in the room 句中的"主语"是:nobody吗? 什么时候用现在完成时和过去完成时