(1) It seems that

例：It seems that Alice is not coming to the party at all.

        看来Alice根本就不准备来参加聚会了。

(2) It happened that...……很偶然.

例：It happened that I won the football lottery last week. 我上星期偶然中了足彩

(3) It occurred to sb that...

例：It suddenly occurred to me that  I knew how to solve that problem.

        我突然想起我知道怎样解决那个问题.

(4) It appears that....      

例：It appears that Tom might change his mind. 看来汤姆会改变主意。