初二现在完成时 since 和 for的用法

用于现在完成时

表示过去已经开始持续到现在的动作或状态常用的时间状语有：for, since, how long, so far, these days等。

1. since :

a).since +时间点①年代 ②时刻数 ③一段时间+ago

b).现在完成时：主句(主语+have/has +延续性动词的过去分词)+ since +从句一般过去时

c) It’s +时间段+since +短暂性动词的过去式

d).时间段+has passed +since +短暂性动词的过去式

for +一段时间

练习：

用since和for填空

1) ______ two years 2) _______ two years ago 3) _______ last month

4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock

7) ______ 4 hours 8) _______ an hour ago 9) _______ we were children

10) _____ lunch time 11) ______ she left here

12). He has lived in Nanjing ________ the year before last.

13). I’ve known him __________ we were children.

14). Our teacher has studied Japanese _________ three years.

15). She has been away from the city ___________ about ten years.

16). It’s about ten years __________ she left the city.

2. for: for +一段时间= since +一段时间+ ago

3. 与时间段连用时，短暂性动词应改为相应的延续性动词。

1) come/go to ------ be at /in 2)leave ----be away from 3)buy ----have

4) borrow /lend -----keep 4)open ---be open 5)close---be closed

6) die---be dead 7) start/begin ----be on

8) join—--be in /be a member of /be a soldier 9) become –be

10) fall asleep ---be asleep 11)catch a cold – have a cold

12) have/has gone to → have been in 13) put on → wear 14) finish/end → be over 15) marry → be married

练习：.短暂性转换延续性

1) His grandfather died two years ago .

His grandfather has ____ ____ for two years.

_____two years _____ his grandfather ____.

Two years ____ ____ ____ his grandfather _____.

2) I became a teacher in 2000.

I ________ __________ a teacher for _________ _________.

3) The shop closed two hours ago.

The shop ________ _________ _________ for _________ _________.

4) The door opened at six in the morning.

The door ________ ________ ________ for six hours.

5) He left Fuzhou just now.