不规则动词：
be是，在，存在
was，were
been
beat敲打，拍子，打，打败
beat
beaten
become变成，成为，变得
became
become
begin开始，首先
began
begun
blow殴打，突然的打击，风吹，吹气于，叫，喘气
blew
blown
break休息，暂停，破裂，突变。打破，违犯，折断，削弱，超过，突变
broke
broken
bring拿来，带来，产生，引起，提出（诉讼）停下
brought
brought
build建造，建筑，构造，
built
built
buy买，购买，
bought
bought
常用介词用法：
1. across（穿过）
My mother lives across the street.
I came across him yesterday. （come across偶然遇到）
The post office is just across the street.
2. after（在……之后）
The children went to bed after saying good night to their parents.
Who will look after your baby while youre away？
（look after 照看，照料，take care of）
The girl is named after her mother.
（name after 以……命名）
Rewrite the sentences after the model. （模仿，仿照）
3. against（反对）
What you are doing is against the rule.
We are against the proposal. （be against 反对）
Nobody has got anything against you.
4. along（沿着）
They walked along Nanjing Road.
There is a cinema along the street.
Im getting along/ on well with my classmates.
5. around（围绕）
We all drew up closely around him.
The guide showed us around the city.
（show sb. around 领某人参观）
6. at（在……）
Lets meet at the station.
She was at a conference.
The committee is to meet at the weekend.
He joined up at eighteen.（join up 参军）
What are you laughing at？ （laugh at 嘲笑）
Lets have a look at the picture. （have a look at 看一看）
My mother was surprised at the news.（be surprised at 吃惊）
He is good at mathematics.（be good at 擅长）
He is good at drawing.
7. before（在……之前）
Dont put the cart before the horse. 不要本末倒置。
Pride comes before a fall. 骄傲就会摔跤。
Before starting the work， we had a discussion.
Before long， the war broke out. （break out 爆发）
I bought the book the day before yesterday.
8. besides （除…之外还）
There are six students in the classroom besides me.
Besides fun and good exercise， swimming is a very useful skill.
