英语时态总结.doc

英语的16种时态
英语共有十六种时态,其表现形式如下(以study为例)

一般时
进行时
完成时
完成进行时
现在
study
studies
am studying
is studying
are studying
have studied
has studied
have been studying
has been studying
过去
studied
was studying
were studying
had studied
had been studying
将来
shall study
will study
shall be studying
will be studying
shall have studied
will have studied
shall have been studying
will have been studying
过去将来
should study
would study
should be studying
would be studying
should have studied
would have studied
should have been studying
would have been studying
 
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。
1. 一般现在时
英语时态分为16种:一般现在、一般过去、一般将来、过去将来时,以及这四者的进行时、完成时和完成进行时。
用法:A) 表示现在发生的动作、情况、状态和特征。
B) 习惯用语。
C) 经常性、习惯性动作。
例:He always helps others. (他总是帮助别人。)
D) 客观事实和普遍真理。尤其要注意,如果前后文不是一般现在时,则无法保持   主句、从句时态一致。
E) 表示一个按规定、计划或安排要发生的动作,(仅限于某些表示“来、去、动   、停、开始、结束、继续”等的动词)可以与表示未来时间的状语搭配使用   。常见的用法是:飞机、火车、轮船、汽车等定期定点运行的交通方式。
例:The next train leaves at 3 o'clock this afternoon.
(下一趟火车今天下午3点开车。)
How often does this shuttle bus run? (这班车多久一趟?)
F) 在时间和条件状语从句里经常用一般现在(有时也用现在完成时)表示将来事   情。
例:When you have finished the report, I will have waited for about 3       hours.(等你完成这份报告的时候,我就已经等了将近3个小时了。)
2. 现在进行时(be doing)
用法:现在正在进行的动作。
3. 现在完成时(have done)
用法:A) 表示动作到现在为止已经完成或刚刚完成。
例:I bought a new house, but I _________ my old one yet, so at the moment I have two houses.
A) didn't sell B) sold C) haven't sold D) would sell
答案是C) haven't sold。
B) 表示从过去某时刻开始,持续到现在的动作或情况,并且有可能会继续延续下去。此时经常用延续性动词。时间状语常用since加一个过去的时间点,或for加一段时间,或by加一个现在时间。
例:Great as Newton was, many of his ideas ___________ today and         are being modified by the work of scientists of our time.
A) are to challenge C) have been challenged
B) may be challenged D) are challenging
全句的意思是:“虽然牛顿是个伟大的人物,但他的许多见解直到今天还在受到挑战,并且被现代科学家的工作所修正。”challenge是及物动词,在本句中应当是被动语态;其动作延续到今天,所以要用现在完成时态。可见答案是C) have been challenged。A) are to challenge和D) are challenging都是主动语态,不可能是答案。B) may be ch