飞翔英语网鼎立推荐！飞翔英语网争做一流的免费英语教学资源网站！感谢大家的支持！

17.if /whether 的用法区别
(1) 表示“是否”的时候可以替换
 I do not know if/whether go shopping tomorrow.
(2) 但是下面有几种情况只能用whether,
a. 后面直接接动词不定式的时候  I do not know whether to go shopping
b. 后面接 or not 的时候   I do not know whether I can pass the exam or not
c. 做主语的时候 Whether he did that is unknown.
(3)当表示如果的时候，就只能用if
18.when / while
 A 强调动作的同时发生
 while后只能接延续性动词，常常是动词的进行时态
 when 后面可以是延续性的动词，也可以是暂断性动词
(1) I was watching TV while my mother was cooking
(2) Tom was wathing TV when I got to his home.
B．when 也可以表示两个动作的先后顺序
When I got to the bus stop , the bus had already left.
19.make sb do sth--- sb + be +made+to +do
  I make Tom do his homework
  Tom is made to do his homework(by me )
  buy sb sth    ---sth +be +bought+for +sb
I bought Tom a book
A book was bought for Tom(by me )
英语中常见的用于被动的结构的句式有
be allowed to do sth  被允许去做某事
be told to do sth     被告诉去做某事
be seen to do sth     被看见作了某事
be asked to do sth    被要求去做某事
20.but , except,besides , except for
 But  常常和表示否定意义的词语连用，如no one ,nothing, nobody
 Nobody but Tom has a atory book
Except 表示“除了…之外”表示排除
All the boys go to school except Tom. He is ill at home
Besides 表示“除了……还有”常常和other 等表示“另外”之意的词语连用。
Do you learn other lessons besides English ?
I have five other  books besides this one .
Except for 表示所排除的部分和前面的不是一个类别。
Your composition is very good except for a few mistakes
21.hear 1.听到，侧重于听的结果 2.听说， 常常接宾语从句
  I hear that Tom is ill at home
 hear of 听说，接名词
   I hear of his illness at home .
 hear from  表示收到某人的来信，但是后面不可以接信
22.use 的有关的句式
 used to do  过去常常做某事
 be used to do  被用来去作某事
 be used to doing 习惯于作某事
 be used for doing 被用来做某事
be used as  被用做为什么东西
(1) He used to smoke but now he is used to drinking milk.
(2)He used to work very late, did not he /used not he ?
(3)The wood is used as a chair
(4)The knife is used to cut meat
  The knife is used for cutting meat.
(4)He is used to the life in the villege.
(5)I use the knife to eat meat
  The knife is used to eat meat
23.make 的有关的句式
   make ab do sth    使某人做某事
   sb be made to do sth  某人被要求去做某事
   be made from…  某物由……组成（不能看出原材料）
   be made of …    某物由……组成（能看出原材料）
   be made into…   材料制成……成品
   be made in       在……地方制造
   be made up of    由……构成（常指成员以及组成部分）
   make good use of 充分的利用
(1) He used to smoke but now he does not and he is used to drinking milk.
(2) The desk is made of wood
  Wood is made into a desk.
  The desk is made in Jiansanjiang
(3) The drink is made from wheat and grains.
(4) Our team is made of five boys .

上一页  [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] 下一页