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1、大学英语语法1基础时态时态（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：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。1. 一般现在时用法：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。Mr. Lee told his students the early b
2、ird (catch) the worm.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 oclock 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？）例：If traffic problems will not be solved soon, driving in c
3、ities will become impossible.2. 现在进行时(be doing) 用法：现在正在进行的动作。表示按计划安排即将发生的动作。例如：She is leaving for Beijing.她要去北京。My father is coming to see me this Saturday.这个星期六我爸爸要来看我。My wife is always criticizing me.我的妻子总是批评我。现在进行时与频度副词always、continually、constantly、forever等连用，常表示不满或抱怨情绪等。注意：The food that Cathy is
4、 cooking in the kitchen _ delicious.A. is smelling B. smells C. has smelled D. will smell感官动词，如smell, taste, sound , feel等A study of the motion of objects is necessary if we are understanding their behaviors and learn to control them.表示感情、拥有关系、状态或思想的动词，如agree、believe, belong, contain, hate, hear(听到)
5、, like, love, mind, notice, possess, see, seem, understand, want等。3. 现在完成时(have done)用法：常与since，for，yet，already等词连用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) didnt sell B) sold C) havent sold D) would sellB) 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
6、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1：Great as Newton was, many of his ideas _ today andare 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例2.Im glad that Peter decided to come to the
7、party because we _ him for several years.A. havent seen B. dont see C. didnt seen D. hadnt seen例3. He _ with Smith at least four times in the past two years.A. has been seen to meet B. was seen to meetC. had been seen meeting D. is seen meetingUntil (till, up to) now, up to the present, so far, in (
8、for, over, during) the past (last, recent) few (several, two) months (years)等短语E.g. Perhaps he has made some friends by now.So far we have only discussed the first five chapters.He _ Fuzhou for five years.A. has come to B. has been inC. has arrived D. has gone to go, come, arrive, die, leave 等He has
9、 come back for three weeks.He came back three weeks ago.He has been back for three weeks.The writer has died for two years.The writer has been dead for two years.The writer died two years ago.C) 表示发生在过去，但对现在仍有影响的动作或情况。It is useless to try to talk to him. He _.A. had just fainted B.is just faintingC.
10、 has just fainted D. has just fainting注意事项A) 现在完成时是联系过去和现在的纽带。现在完成时和过去时的区别在于：现在完成时强调动作的动态，或受动态的影响，是动态的结果，对现在有影响；过去时只表示过去的某个具体时间里发生的动作，与现在没有联系。例：He worked in that hospital for 8 years.（他曾经在那家医院工作了8年。这只是讲述一个过去的事实，他现在已经不在那家医院了。）He has worked in that hospital for 8 years.（他已经在那家医院里工作了8年。表示他从过去开始工作，一直工作到
11、现在，现在仍在那家医院工作。）B) 因为含有for加一段时间或since加一个时间点这样的时间状语的完成时，有动态和延续性的特点，所以不能使用终端动词或瞬间动词。例：My sister has been married for 5 years.（过去分词做表语表示状态，可以延续）My sister has married. Dont disturb her.（终端动词）C) 在This is the first/ second/ third time that句型里要求用完成时。例：This is the second time that the products of our company
12、 have been shown in the International Exhibition.（这是我公司产品第二次参加国际展览会。）D) 句型It is/ has beensince所使用的两种时态都正确。例：It is/ has been 10 years since I last saw him.（从我上次见到他以来已经10年了。）E) have been to 与 have gone to的区别4. 现在完成进行时(have been doing)用法：表示某一动作开始于过去某一时间，延续或重复地出现至今，或将继续延续至将来。例：We have been working on th
13、is project for over a month now.（到目前为止，我们一直在处理那个项目，已经花了一个多月时间了。）注意事项：与现在完成时相比，现在完成进行时更强调：在从过去到现在的时间里，动作或状态一直持续或一直反复出现。例：1997年6月四级第45题It seems oil _ from this pipe for some time. Well have to take the machine apart to put it right.A) had leaked B) is leaking C) leaked D) has been leaking5. 一般过去时用法：A)
14、 表示过去某个时间发生的动作或情况。B) 表示过去习惯性动作。特别是由would/ used to do表达的句型，本身表示的就是过去时。例：The old man would sit on a bench in the quiet park and look at others for hours without doing anything or talking to anybody.（老人过去常常坐在宁静的公园里的一条长椅上，看着其他的人，一坐就是数个小时，什么也不干，也不和任何人交谈。）He used to visit his mother once a week.（他以前总是每周看望
15、一次他的母亲。）C) 有时可代替一般现在时，表达一种婉转、客气、礼貌、商量的语气。例：I wanted to ask you if I could borrow your car?（我想向您借车用一用，可以吗？）Would you mind my sitting here?（您介意我坐在这里吗？）注意事项：A) 注意时间状语的搭配。一般过去时的时间状语应该是表示过去某个时间的词或词组，如：yesterday, last month, in 1999, two days ago等，绝对不可与recently, in the past 10 years, this month等连用，因为这样的时间状语都与现在有关系，应该用现在完成时或一般现在时。B) used to do的否定形式和疑问形式很特别：你怎么写都正确。以否定形式为例：us
