【1. 用于现在完成时的句型】
1)It is the first / second time.... that…结构中的从句部分，用现在完成时。
例如：
It is the first time that I have visited the city. 这是我第一次访问这城市。
This is the first time (that) I've heard him sing. 这是我第一次听他唱歌。
注意：It was the third time that the boy had been late.
2)This is +形容词最高级+that…结构，that 从句要用现在完成时。
例如：
This is the best film that I've (ever) seen. 这是我看过的最好的电影。
典型例题
(1) ---Do you know our town at all? ---No, this is the first time I ___ here.
A. was B. have been C. came D. am coming
答案B. This is the first time 后面所加从句应为现在完成时，故选B。
【2. 比较since和for】
Since 用来说明动作起始时间，for用来说明动作延续时间长度。
例如：
I have lived here for more than twenty years.我住在这儿二十多年了。
注意：并非有for 作为时间状语的句子都用现在完成时。
I worked here for more than twenty years. (我现在已不在这里工作。)
注意：用句型转换的方法，很容易排除非延续动词在有for/since结构的完成时中的误用。
1)(对) Tom has studied Russian for three years. = Tom began to study Russian
three years ago, and is still studying it now.
2)(错) Harry has got married for six years. = Harry began to get married six
years ago, and is still getting married now.
显然，第二句不对，它应改为 Harry got married six years ago. 或 Harry has been married for six years.
【3. since的四种用法】
1) since +过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half past six)。
例如：
I have been here since 1989. 1989起，我一直在这儿。
2) since +一段时间+ ago。
例如：
I have been here since five months ago. 我在这儿，已经有五个月了。
3) since +从句。
例如：
Great changes have taken place since you left. 你走后，变化可大了。
4) It is +一段时间+ since从句。
例如：
It is two years since I became a postgraduate student. 我考上研究生有两年了。
【4. 延续动词与瞬间动词】
1) 用于完成时的区别
延续动词表示经验、经历; 瞬间动词表示行为的结果，不能与表示段的时间状语连用。例如：
He has completed the work. 他已完成了那项工作。 (表结果)
I've known him since then. 我从那时起就认识他了。(表经历)
2) 用于till / until从句的差异
延续动词用于肯定句，表示"做……直到……" 瞬间动词用于否定句，表示"到……，才……"。例如：
He didn't come back until ten o'clock. 他到10 点才回来。
He slept until ten o'clock. 他一直睡到10点。
典型例题
1. You don't need to describe her. I ___ her several times.
A. had met B. have met C. met D. meet
答案B. 首先本题后句强调对现在的影响，我知道她的模样，你不用描述。再次，several
times告知为反复发生的动作，因此用现在完成时。
【5. 过去完成时】
1) 概念：表示过去的过去
其构成是had +过去分词构成。
2) 用法
a. 在told, said, knew, heard, thought等动词后的宾语从句。例如：
She said (that)she had never been to Paris. 她告诉我她曾去过巴黎。
b. 状语从句
在过去不同时间发生的两个动作中，发生在先，用过去完成时;发生在后，用一般过去时。例如：
When the police arrived, the thieves had run away. 警察到达时，小偷们早就跑了。
c. 表示意向的动词，如hope, wish, expect, think, intend, mean,
suppose等，用过去完成时表示"原本…，未能…"。例如：
We had hoped that you would come, but you didn't. 那时我们希望你能来，但是你没有来。
3) 过去完成时的时间状语before, by, until , when, after, once, as soon as。
例如：
He said that he had learned some English before. 他说过他以前学过一些英语。
The students ___ busily when Miss Brown went to get a book she ___ in the
office.
A. had written, left B，were writing, has left C. had written, had left D.
were writing, had left
答案D.
"把书忘在办公室"发生在"去取书"这一过去的动作之前，因此"忘了书"这一动作发生在过去的过去，用过去完成时。句中when表示的是时间的一点，表示在"同学们正忙于……"这一背景下，when所引导的动作发生。因此前一句应用过去进行时。
注意： had hardly… when 还没等…… 就……。例如：
I had hardly opened the door when I he hit me. 我刚打开门，他就打了我。
had no sooner…than 刚…… 就……。例如：
He had no sooner bought the car than he sold it. 他刚买了这辆车，转眼又卖了。
【6. 用一般过去时代替过去完成时】
1) 两个动作如按顺序发生，又不强调先后，或用then，and，but 等连词时，多用一般过去时。
例如：
When she saw the mouse，she screamed. 她看到老鼠，就叫了起来。
My aunt gave me a hat and I lost it. 姑妈给了我一顶帽子，我把它丢了。
2 ) 两个动作相继发生，可用一般过去时;如第一个动作需要若干时间完成，用过去完成时。
例如：
When I heard the news, I was very excited.
3) 叙述历史事实，可不用过去完成时，而只用一般过去时。
【7. 将来完成时】
1) 构成will have done
2) 概念
a. 状态完成：表示某事继续到将来某一时为止一直有的状态。例如：
They will have been married for 20 years by then. 到那时他们结婚将有二十年了。
b. 动作完成：表示将来某一时或另一个将来的动作之前，已经完成的动作或获得的经验。例如：
You will have reachedShanghaiby this time tomorrow. 明天此时，你已经到达上海了。
【8. 现在进行时】
现在进行时的基本用法：
a. 表示现在(指说话人说话时)正在发生的事情。例如： We are waiting for you. 我们正在等你。
b. 习惯进行：表示长期的或重复性的动作，说话时动作未必正在进行。例如：
Mr. Green is writing another novel. 他在写另一部小说。(说话时并未在写，只处于写作的状态。)
c. 表示渐变，这样的动词有：get, grow, become, turn, run, go, begin等。例如：
The leaves are turning red. 叶子在变红。
It's getting warmer and warmer. 天越来越热了。
d. 与always, constantly, forever 等词连用，表示反复发生的动作或持续存在的状态，往往带有说话人的主观色彩。例如：
You are always changing your mind. 你老是改变主意。
典型例题
My dictionary ___, I have looked for it everywhere but still___ it.
A. has lost, don't find B. is missing, don't find C. has lost, haven't
found D. is missing, haven't found.
答案D. 前句是一个仍在持续的状态，应用进行时，由于没有找到，其影响仍然存在，应用完成时，瞬间动词用于否定式时可用于完成时。
【9. 不用进行时的动词】
1)表示事实状态的动词，如have, belong, possess, cost, owe, exist, include,contain, matter, weigh, measure, continue等。
例如：
I have two brothers. 我有两兄弟。
This house belongs to my sister. 这房子是我姐的。
2)表示心理状态的动词，如know, realize, think see, believe, suppose, imagine, agree, recognize, remember, want, need, forget, prefer, mean, understand, love, hate等。
例如：
I need your help.我需要你的帮助。
He loves her very much. 他爱她很深。
3)瞬间动词，如accept, receive, complete, finish, give, allow, decide, refuse等。
例如：
I accept your advice. 我接受你的劝告。
4)系动词，如seem, remain, lie, see, hear, smell, feel, taste, get, become, turn等。
例如：
You seem a little tired. 你看上去有点累。
【10. 过去进行时】
1)概念：表示过去某时正在进行的状态或动作。
2)过去进行时的主要用法是描述一件事发生的背景;一个长动作延续的时候，另一个短动作发生。
3) 常用的时间状语有this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while等。
例如：
My brother fell while he was riding his bicycle and hurt himself.
我兄弟骑车时摔了下来，受了伤。
When I got to the top of the mountain, the sun was shining.
我到达山顶时，阳光灿烂。
典型例题
1) Mary ___ a dress when she cut her finger.
A. made B. is making C. was making D. makes
答案C.
割伤手指是已发生的事情，应用过去时。同时，when表时间的同时性，"玛丽在做衣服时"提供事情发生的背景，因此用过去进行时。
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