feel/find/think it adj./n. to do sth. 认为某事……
在此结构中it为形式宾语，不定式短语作真正的宾语。例如：
I find it very interesting to play football. 我发现踢足球很有趣。
She thinks her duty to help us. 她认为帮助我们是她的职责。
get ready for sth./ to do sth.
Get ready for sth.意为“为某事做准备”，get ready to do sth.“准备做某事”。例如：
We are getting ready for the meeting. 我们正在为会议做准备。
They were getting ready to have a sports meet at the moment. 他们那时正准备开运动会。
get/receive/have a letter from 收到……的来信
相当于hear from 例如：Did you receive a letter from John?你收到约翰的来信了吗?
I got a letter from my brother yesterday. 我昨天收到了我弟弟的一封来信。
had better (not)do sth. 最好(别)做某事
had better为情态动词，其后需用动词原形。had better常用缩写，变成'd better，其否定形式是在其后直接加not.例如：We had better go now. = We’d better go now. 我们最好现在走吧。You'd better take a rest. 你最好休息一下。
You'd better not go out because it is windy. 今天刮风，你最好别出去了。
have sth. done 使(某事)完成，使发生 (动作由别人完成)
sth.为宾语，done为过去分词作补语。例如：
We had the machine repaired. 我们请人把机器修好了。
注意区分：We have repaired the machine. 我们(自己)已经修好了机器。
help sb. (to)do sth./with sth. 帮助某人(做)某事
其中的to可以省略。例如：I often help my mother with housework.我常常帮助妈妈做家务。
Would you please help me (to)look up these words? 请你帮助我查查这些词好吗?
How do you like……? 你认为……怎么样?
与what do you think of …?同义。例如：How do you like the weather in Beijing? 你认为北京的天气怎么样? 你觉得这部新电影如何?
—What do you think of your boss? —He is strict with us.
I don't think/believe that… 我认我/相信……不……
其中的not是对宾语从句进行否定而不是对主句(否定前移)。that可省略。例如：
I don't think it will rain. 我认为天不会下雨。
I don't believe the girl will come. 我相信那女孩不会来了。
我认为他并不聪明。
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。
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20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20多年了。since I moved to Zhengzhou.
