常见的八种英语时态详解
时态（Tense）是表示行为、动作和状态在各种时间条件下的动词形式。因此，当我们说时态结构的时候，指的是相应时态下的动词形式。英语时态分为16种
1. 一般现在时
基本结构：①be动词am/is/are；②行为动词原形或单数第三人称。
否定形式：①am ／is ／are ＋________；②此时态的谓语动词若为行为动词，则在其前加_________，如主语为第三人称单数，则用___________，同时还原行为动词。
一般疑问句：①把be动词放于句首；②用助动词do提问，如主语为第三人称单数，用does，同时，还原行为动词。
提示词：always , everyday , often , once a week (month , year , etc.) ,
sometimes , seldom , usually
1) 描述当前时间内经常出现、反复发生的动作或存在的状态。
She doesn't often write to her family, only once a month.
It seldom rains here .这儿很少下雨。
2）仅为了描述状态、性质、特征、能力等等。
这里的目的是为了"描述现阶段的动作或状态"，其重点"不是强调动作发生的时间、或进行的状态"。例如：
He can speak five foreign languages .
Changjiang River is one of the longest rivers in the world.
3) 陈述客观事实、客观真理。
The earth goes around the sun .地球绕着太阳转。
4) 根据英文语法规定，当主句的谓语动词是一般将来时，那么时间或条件状语从句的谓语动词只能用一般现在时来表示将来要发生的动作。例如：
I'll tell him the news when he comes back. 他回来时，我将告诉他这个消息。
If you take the job , they will talk with you in greater details.
5）现在时的特殊用法：一般现在时表过去
1. 用于某些动词(tell, say, hear, learn, gather等)表示不确定的过去时间。如：
I hear that he got married last month. 我听说他上个月结婚了。
Mary says you told her to come over here. 玛丽说是你让她到这儿来的。
2. 当要陈述一个客观事实时，有时即使有过去时间状语也可用一般现在时。如：
The story is set in the summer of 1937. 故事的背景是1937年夏天。
The story begins in the year 1937. 故事开始于1937年。
练习
1)He always _____ ( get）up early.
2)Mary often ______（do）some shopping on Sundays
3).I’ll go with you as soon as I_______（finish)my homework.
4)If he _______(come) here, I will tell you
5）The earth ________( move) round the sun.
6)Tom sometimes ________(have) lunch at school.
7)Lily usually ________(fly) kites on weekends.
8)They ________(be) never late for class.
9）Light _________(travel) faster than sound .
10)________Jim _________(speak) English ？
2.一般过去时
1.定义：表示过去某一点或某一段时间的动作或存在的状态。
2.提示词:yesterday, the day before yesterday,just now , last
week/month/year, ….ago, a moment ago ,after three days, last term, in September, in 2000,
3.动词过去式的构成：
1）v+ed 2) e+ed
3）重读闭音节双写最后一个辅音字母再加ed。
planned, stopped, preferred, shopped
4）辅音加y结尾的把y改i再加ed。
Study,copy ,carry,worry
5）不规则
练习
1）Tom ______(watch) TV last night .He _____(go) nowhere.
2)She ______(give) me a present last Christmas.
3)The story ______(happen) two years ago.
4)It was very cold , so he ____(put) on his coat.
5)Who _____(break) the windows just now ?
6）I ___（get) a letter from my brother a moment ago. 7）He ______(try ) to help us when we were in trouble.
