初中英语八大时态全套精讲
1. 一般现在时的用法
1) 经常性或习惯性的动作，常与表示频度的时间状语连用：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：以上三种情况用于宾语从句中，即使主句是过去时，从句谓语也要用一般现在时。
例：Columbus proved that the earth is round..
4) 现在时刻的状态、能力、性格、个性。
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.
第一句用一般现在时，用于操作演示或指导说明的示范性动作，表示言行的瞬间动作。再如：Now watch me, I switch on the current and stand back. 第二句中的now 是进行时的标志，表示正在进行的动作的客观状况，所以后句用一般现在时。
二.构成及变化
1 、be 动词的变化
肯定句：主语+be(am,is,are)+其它。如：I am a boy. 我是一个男孩。
否定句：主语+ be + not + 其它。如：He is not a worker. 他不是工人。一般疑问句：Be +主语+其它。如：-Are you a student? -Yes. I am. / No, I'm not.
特殊疑问句：疑问词+一般疑问句。如：Where is my bike?
2、行为动词的变化当主语为第一，二人称及复数时，助动词为do
肯定句：主语+动词原形(+其它)。如：We often play basketball after school.
否定句：主语+ don't+ 动词原形什其它)。女口：we don' t play basketball after school.
一般疑问句：Do +主语+动词原形+其它? 如：Do you often play basketball after school l? Yes, we do. / No, we don't.
特殊疑问句：疑问词+以do开头的一般疑问句？女口：W hat do you often do after school ? 当主语为第三人称单数时,助动词为does
肯定句：主语+动词三单式(+其它)。如：He swims well.
否定句：主语+ doesn' t+动词原形什其它)。如：He doesn' t swim well..
一般疑问句：Does +主语+动词原形+其它。如：Does he swim well ?
Yes, he does. / No, he doesn't.
特殊疑问句：疑问词+以does开头的一般疑问句？
如：How does your father go to work?
三、第三人称单数的动词变化规则(只有在第三人称为主语的肯定句中，动词才用三单式)
(1) 多数动词直接加s:
runs gets likes collets takes plays climbs …… .
(2) 结尾是s, x, sh, ch, o ,前为辅音字母,结尾加es :
watches teaches goes does washes crosses mixes brushes
(3) 动词末尾y 前为辅音:将y 改为i 加es:
study T studies fly 宀flies carry carries crycries
但在 y 前如果为元音则直接加 s: buys says
2 一般过去时的用法
1)在确定的过去时间里所发生的动作或存在的状态。
时间状语
有： yesterday, an hour ago, the other day, in 1982 yesterday morning (afternoon,
evenin g
…) last ni ght (week, mon th, year …), a mome nt ago , a week ago, three years
ago …just now,等。 Where did you go just now?
2) 表示在过去一段时间内，经常性或习惯性的动作。
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. It is time you went to bed. would (had) rather sb. did sth. I'd rather you came tomorrow.
4) wish, wonder, think, hope 等用过去时，作试探性的询问、请求、建议等。 I thought you might have some. 我以为你想要一些。
比较：一般过去时表示的动作或状态都已成为过去，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 ) used to / be used to used to + do ："过去常常”表示过去习惯性的动作或状态，但如今已不存在。 Mother used not to be so forgetful. Scarf used to take a walk. (过去常常散步 )
be used to + doing :对 ..... 已感到习惯，或"习惯于”，to 是介词，后需加名词或动名词。 He is used to a vegetarian diet.
Scarf is used to taking a walk.( 现在习惯于散步 ) 典型例题 --- Your phone number again? I ___ quite catch it. --- It's 69568442.
A. didn't
B. couldn't
C. don't
D. can't
答案 A. 本句虽没有明确的时间状语，但从语意上看出，在听的时候没有听懂这个动作发生 在过去，因此应用过去时。 二、构成及变化
1. Be 动词在一般过去时中的变化：
am 和 is 在一般过去时中变为 was 。 (was not=wasn 't) are 在一般过去时中变为 were 。 (were not=weren ' t)
带有 was 或 were 的句子，其否定、疑问的变化和 is, am, are 一样，即否定句在 was 或 were 后加not , —般疑问句把 was 或were 调到句首。 2. 行为动词在一般过去时中的变化：
肯定句 ： 主语 + 动词的过去式 .I watched a film last Sunday .
否定句 ： 主语+ didn ' t + 动词原形 .I didn ' t watch a film last Sunday . 一般疑问句： Did + 主语 + 动词原形 ?Did you watch a film last Sunday ? Yes, I did . No , I didn ' t .
你该睡觉了。 你早该睡觉了。
表示 '宁愿某人做某事
