1.neither ...nor.../either...or.../both...and.../not only...but also...

(1)Neither you nor I am new here,so please help the poor.(就近原则）

(2)Either Tom or Peter was robbed yesterday.(就近原则）

(3)Both Mr Wang and Mr Li have been to the USA.(王先生和李先生都去过美国）

(4)Not only Mr Wang but also Mr Li has been to the USA.(就近原则）

2.so that/so...that

(1)We work hard so that we can pass the coming exam.(为了通过即将到来的考试，我们努力学习)

(2)She walked so fast that I couldn't follow her.(她走得太快，我跟不上)

3.阻止。。。做。。。

(1)stop sb. (from) doing sth. (2)prevent sb. (from) doing sth. (3)keep sb. from doing sth.

4.数词的用法

(1)Many thousands of trees must be planted every year.

(2)There are five thousand workers in this factory.

(3)Six hundred of the victims are from India.(受害者中的600位是印度人）

5.（1）We must plant the trees around the lake.(变为被动语态)

The trees must be planted around the lake.

(2)Students should listen to the teachers carefully.(变为被动语态）

The teachers should be listened to carefully by students.

6.There are twenty more trees to be planted.=There are another twenty trees to be planted.

7.Is the man tall? More or less.

We feel more or less tired.(我们感觉有点累)