时态讲解I.doc

时态讲解I
A.一般时：
(1)Sb do/does sth _______________________ 提示词：everyday, always...
表示经常性动作
(2)Sb did sth _______________________ 提示词：yesterday, 时间ago, 时间 earlier
表示动作已完成
(3)Sb will do sth _______________________ 提示词：tomorrow, in the futere, in 15 minutes....
表示动作还没做，将要做
B.进行时
(1)Sb am/are/is doing sth _______________________ 提示词：now, at the moment
表示动作正在发生
Internet is becoming more and more important now.
(2)Sb was/were doing sth _______________________ 提示词：then, at that monent
表示在过去某一刻正在发生的动作
The moment I saw him, he was doing his homework.
(3)Sb will be doing sth ___ 提示词：at 6 tomorrow
表示在将来某一刻正在发生的动作
I think she will be having a lesson at 8 tomorrow.
C.完成时
Sb have/has done sth _______________________ 提示词：already
强调某个动作已经完成，且效果对现在有点影响
如：I have finished my homework.
Sb had done sth _______________________
强调某个动作（v2）发生在一个过去的动作（v1）之前
如When I got to the station, the train had left.
D.杂糅型：
Sb would do _______________________
在过去的时刻中还没发生的动，如：She said she would visit us next summer.
Sb have/has been doing _______________________
强调动作从过去到现在一直在做 如：He has been doing his homework since he went home

与时态有关的常见句型
1. Sb was/ were doing sth when sd did sth 如：The Green ________(be) sleeping when the fire ________(happen)
2. Sb has/have done sth since sb did sth 如：She _________(live) in New York since she came to America.
3. It is 第几次 that sb have/has done sth 如：It was the third time that he ________(lose) his wallet.
It was 第几次 that sb had done sth
4 sb had done sth before sb did sth Jack _________(know) Mary before he went to the college.
注：before前的主句常用完成时态
5. sb did sth 时间ago——注：ago前/后的主句常用一般过去式 10 years ago, he ________(work) in a farm.
6.主从复合句中，一般而言，主句时态决定从句时态
主句
从句
例句
一般现在时
任意时态
We believe China ______________(become) stronger now.
一般过去式
过去的任意时态
She said she _______________(see) the movie before
特例1：如从句中的内容是客观事实，则不受主句时态影响
如：The teacher told us that speed __________(travel) faster than sound.
特例2：如主句动词为“一坚持(insist), 二命令(order, commend), 三建议(suggest, advise, propose), 四要求(demand, ask,require,request)”时，后面的从句常用sb (should) do sth.
如：The officer requested that the soilder _________(be) back to the camp bebore 10 pm.
7.条件句（if, as soon as, as long as）与主句的时态：主讲从现 如：If it _______(rain) tomorrow, we ______(cancel) it.