初中英语知识点样稿.doc

通常现在时使用方法
1) 常常性或习惯性动作，常和表示频腮度时间状语连用。
时间状语： every…, sometimes, at…, on Sunday
I leave home for school at 7 every morning.
2) 客观真理，客观存在，科学事实。
The earth moves around the sun.
Shanghai lies in the east of China.
3) 表示格言或警句中。
Pride goes before a fall. 骄者必败。
注意：此使用方法假如出现在宾语从句中，即使主句是过去时，从句谓语也要用通常现在时。
例：Columbus proved that the earth is round..
4) 现在时刻状态、能力、性格、个性。
I don’t want so much.
Ann Wang writes good English but does not speak well.
比较：Now I put the sugar in the cup.
I am doing my homework now.
第一句用通常现在时，用于操作演示或指导说明示范性动作，表示言行瞬间动作。再如：Now watch me, I switch on the current and stand back. 第二句中now是进行时标志，表示正在进行动作客观情况，因以后句用通常现在时。
2. 通常过去时使用方法
1）在确定过去时间里所发生动作或存在状态。
时间状语有：yesterday, last week, an hour ago, the other day, in 1982等。
Where did you go just now?
2）表示在过去一段时间内，常常性或习惯性动作。
When I was a child, I often played football in the street.
Whenever the Browns went during their visit, they were given a warm welcome.
3）句型：
It is time for sb. to do sth "到……时间了" "该……了"
It is time sb. did sth. "时间已迟了" "早该……了"
It is time for you to go to bed. 你该睡觉了。
It is time you went to bed. 你早该睡觉了。
would (had) rather sb. did sth. 表示’宁愿某人做某事’
I’d rather you came tomorrow.
4) wish, wonder, think, hope 等用过去时，作试探性问询、请求、提议等。
I thought you might have some. 我认为你想要部分。
比较：
通常过去时表示动作或状态全部已成为过去，现已不复存在。
Christine was an invalid all her life.
(含义：她已不在人间。)
Christine has been an invalid all her life.
(含义：她现在还活着)
Mrs. Darby lived in Kentucky for seven years.
(含义：达比太太已不再住在肯塔基州。)
Mrs. Darby has lived in Kentucky for seven years.
( 含义：现在还住在肯塔基州，有可能指刚离去)
注意： 用过去时表示现在，表示委婉语气。
1）动词want, hope, wonder, think, intend 等。
Did you want anything else?
I wondered if you could help me.
2）情态动词 could, would.
Could you lend me your bike?
3. used to / be used to
used to + do："过去常常"表示过去习惯性动作或状态，但现在已不存在。
Mother used not to be so forgetful.
Scarf used to take a walk. (过去常常散步)
be used to + doing： 对