Grammar优秀说课稿

Grammar Present perfect tense

1一) 现在完成时的基本用法：

1. 表示动作到现在为止已经完成或刚刚完成。

e.g. I have finished my work. We have set up many new factories. 2. 动作发生在过去, 强调对现在的结果、影响等。

e.g. Have you ever seen the film “Harry Potter”? I’ve spent 3 years in the countryside. 3. 表示动作发生在过去, 并且一直持续到现在, 甚至还可能继续下去, 句中使用持续性动词, 且常有表示一段时间的时间状语。

e.g. We haven’t seen each other for ten years. I’ve been an English teacher for about 20 years. 现在完成时可以用在条件或时间状语从句中, 表示将来某个时刻之前已经完成的动作。

e.g. I’ll go home as soon as I have finished my homework.

Please lend me that book if you have finished reading it.

(二) 使用现在完成时的句型

1) 现在完成时+since + 点时间状语(名词、短语、从句, 其中从句用一般过去时) 2) 现在完成时+ for+ 段时间状语

3) It / This is the first /其他序数词/ last time + that 从句中, 从句使用现在完成时。

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注意: 在下面的句子中, 主句的谓语动词常用一般现在时：

It is three years since I began to work on the farm.

It’s a long time since I saw you last. 三) 终止性动词与延续性动词：

1. 终止性动词: 表示短暂的运动状态,不能和表示一段时间的状语连用,常用的动词有: come, go,

start, begin, leave, arrive, reach, get, get up , join, marry, open, close, give, lend, borrow, finish, break, see, hear, notice, find, understand, die 等

.延续性动词: 表示长时间的运动状态,能和表示一段时间的状语连用。

常用的动词有: live, study, work, teach, stay, read, play, fly, talk, rain, eat, run等

1. Up to now, the program _____ thousands of children who would otherwise have died.

A. would save

B. saves

C. had saved D. has saved 2. —I’m sorry, but I don’t quite follow you. Did you say you wanted to return on September 20?

—Sorry, I _____ myself clear. We

want to return on October 20.

A. hadn’t made B. wouldn’t make

C. don’t make

D. haven’t made 3. —When shall we restart our business?

—Not until we _____ our plan．

A. will finish

B. are finishing

C. are to finish

D. have finished 4. When you are home, give a call to let me know you _____ safely.

A. are arriving

B. have arrived

C. had arrived

D. will arrive 5. The book has been translated into thirty languages since it _____ on the market in 1973.

A. had come

B. has come

C. came

D. comes