不定式时态：一般式和进行式的区别.一般式和进行式都用在动作和谓语同步的情况下,那有什么区别叻?eg：He is believed to come.和He is believed to be coming.有什么区别?

He is believed to come.(=It is believed that he will come.) 要来,还没来
He is believed to be coming.(=It is believed that he is coming.) 正在来路上
He is believed to have come.(= It is believed that he has come.) 已经来了