1. It happens that… 碰巧……
相当于happen to do.例如：It happened that I heard their secret.
可改写为：I happened to hear their secret. 我碰巧听到了他们的秘密。
2. It's/has been +一段时间+since从句 自从某时起做某件事情已经一段时间了。
该句型中since引导的时间状语从句常用一般过去时。例如：
It's twenty years since he came here. 他来这里已经0年了。
It has been six years since he married Mary. 他和玛丽结婚已经六年了。考试用书
如果since从句中的谓语动词是延续性动词，则表示“从该动作结束起一直到现在的时间”。 例如：It's three days since he stayed here. 他离开这儿有三天了。
我搬家到郑州已经0多年了。since I moved to Zhengzhou.
3. It is +adj./n. + for sb. to do sth. 做某事对某人来说……
It是形式主语，真正的主语是不定式to do sth. for sb. 是不定式的逻辑主语。例如：
It's not easy for us to study English well. 对我们来说学好英语并不容易。
It's a good idea for us to travel to the south. 去南方旅行对我们来说是个好主意。
对我来说把英语学好非常重要。to learn English well.
4. It's + adj. + of sb. to do sth.
It是形式主语，to do sth.是真正的主语， of sb. 是逻辑主语，当表语(即形容词)能对逻辑主语描述时，常用介词of，而不用for.例如：It's very polite of you to give your seat to old people. 你给老人让座，非常有礼貌。 It’s very kind of you to help me.
你能来车站接我真是太好了。to pick me up at the station.
5. It seems/appears that… (在某人看来)好像……
此句中的it是主语，that引导的是表语从句。例如：It seems that he is lying. 看样子他好像是在撒谎。It appears to me that he never smiles.
看样子要下雨了。it's going to rain.
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