应急预案修订
英语时态8种基本时态讲解
一．概念：英语中表示不同时间发生的动作或存在的状态，需用不同的动词形式表示，这种不同的动词形式称为时态;
二．种类：基本时态
一般现在时一般过去时
现在进行时过去进行时
一般将来时过去将来时
现在完成时过去完成时
三．用法：
1一般现在时表示经常发生或习惯性的动作或状态及客观现实和普遍真理;
一般现在时常以动词原形表示，但当主语是第三人称单数时，动词词尾加-s 或-es;
2句型结构：主语＋Ｖ.包括be动词＋宾语＋…
She is an engineer.
He has breakfast at 6:00 every day.
3注意：
a一般现在时通常与always , often , usually , every day , sometimes , once a week 等时间状语连用;
I always watch TV at 8:00 in the evening.
They go home once a week.
We usually do our homework at home.个税缴纳
b表客观现实或普遍真理;
The sun always ris in the east.
The light travels faster than the sound.
c表永远性的动作或状态;融资协议
He lives in the country.
4第三人称单数变化形式;
捕的组词a一般情况动词在词尾加-s .帅哥背景图
come---comes speak---speaks work---works live---lives
b以o, s, x, ch, sh结尾的单词在词后加-es.
do---does go---goes finish---finishes brush---brushes
fix---fixes pass---pass watch---watches
c以“辅音字母＋y”结尾的单词变y为i加-es.
Study---studies carry-carries cry---cries
d以“元音字母＋y”结尾的单词直接加-s.
play---plays stay---stays
例句：我们每天晚上九点做作业;
我在早上七点半起床;
他每天七点去上班;
我们经常下午打篮球;
他喜欢音乐;
地球围绕太阳转;
火车六点出发;
5否定句和疑问句;
a-----He is an engineer.
-----He isn’t an engineer.
-
----Is he an engineer
-----Yes, he is ./ No, he isn’t.
b----We get up at 7:30 in the morning .
-----We don’t get up at 7:30 in the morning .
扎肉-----Do you get up at 7:30 in the morning
-----Yes, we do. / No, we don’t.
c----He likes music.
-----He doesn’t like music.
-----Does he like music
-----Yes ,he does./ No, he doesn’t .
1一般过去时表示发生在过去的动作或存在的状态，通常与表示过去的时间状语yesterday, last night ,some years ago, in 1990,in tho days.等连用;
I was a student 6years ago.
I went to Beijing last year.
They saw a film last night .
2句型结构：主语＋Ｖ.过去时＋宾语＋…
例句：昨天他很忙;
去年他抽烟了;
两年前他去参军了;
他在1990年去世了;
3否定句和疑问句;
a----He was busy yesterday.
-----He wasn’t busy.
-----Was he busy
-----Yes, he was./ No, he wasn’t.
b----He smoked last year.
-----He didn’t smoke last year.
-----Did he smoke last year
-----Yes ,he did ./No ,he didn’t.赏心悦目的意思
c----He joined the army in 1990.
-----He didn’t joined the army in 1990.
-----Did he join the army in 1990
-----Yes ,he did ./No ,he didn’t.
4动词过去式变化规则;
a一般情况下的词加-ed.
work---worked call----called laugh----laughed
Explain----explained finish----finished knock----knocked
b以不发音的字母e结尾的单词直接加-d .宋代古诗
live----lived change----changed smoke----smoked die----died
graduate----graduated drive----drove
c以“辅音字母＋y”结尾的单词，变y为i加-ed.
study----studied carry----carried cry----cried
try----tried marry----married
d以“元音字母＋y”结尾的单词直接加-ed.
play----played stay----stayed
e以“一个元音字母＋一个辅音字母”结尾的单词应先双写这个辅音字母然
后再加-ed.
stop----stopped plan----planned pat----patted
f动词不规则变化：
do----did go----went come----came run----ran write----wrote
begin----began drink----drank keep----kept leave----left sleep----slept
make----made lie----lay dig----dug eat----ate know----knew
cut----cut t----t let----let read----read hurt----hurt
例句：我前天拿走了这本书;
去年我买了一辆自行车;
每天晚上我听音乐;
她通常待在家里;
两天前我完成了这项工作;
