It seems that ~ (似乎) It happens that ~ (碰巧)
It seems that he is sick. = He seems to be sick. 他似乎病了。
It seems that he was sick. 似乎他那个时候病了。
It seemed that my father was satisfied with my grades.
It seems that he was very happy at that time. 他当时似乎非常高兴。
It seems that you didn't sleep well last night.你似乎昨晚没睡好。
It happens that I know him. = I happen to know him. 我碰巧认识他。
It happens that I have no money with me, so I can't lend you any.
It happened that I was in the bank when the robbery happened.