The Present Perfect Tense

(the usages of

since and for)

现在完成时（ since 与 for 的用法）

广州市第一一三中学陶育实验学校 李成香 樊泳钊

Let’s revise the Present Perfect Tense

nowpast future

现在完成时强调过去发生的动作对现在的影响或过去开始发生一直持续到现在的动作。

…….

The man has improved the robot since he invented it.The man has improved the robot for two years.

The boy and the robot have been friends since they met in the office.

The boy and the robot have been friends for two weeks.

含有 since, for 引导的时间状语的句子常用现在完成时。

…….

Choose the correct answer.

Let’s find out the rules for using “since”

I have lived here since 2003.

She has stayed in Guangzhou since three months ago.

Mr. Fan has worked here since he came to Guangzhou.

since的用法1 ．since +

2. since +

3. since +

过去的时间点时间段 +ago

一般过去时的从句

Let’s find out the rules for using “for”

The man has improved the robot for two years.

The boy and the robot have been friends for two

weeks.

The robot has taken care of the boy for one month.for的用法

1 ．for + 时间段

since的用法1 ．since + 过去的时间点2. since + 一般过去时的从句3. since + 时间段 +ago

for的用法1 ．for + 时间段

Go over the usages of “since” and “for” again.

1. ________ two years 2. ________ two years ago

3. ________ last month 4. ________ ten days

5. ________ yesterday 6. ________ 4 o’clock

7. ________ he made it 8. ________ four hours

for

A quiz is coming.

Fill in the blanks with “since” or “for”

since

since for

since since

since for

My brother has had this bike for five years.My brother has bought this bike for five years.

since 和 for 引导的时间状语都表示持续的一段时间，所以必须和持续性动词连用，不可与短暂性动词连用。

buy 是短暂的动作，即短暂性动词。have 是持久的动作，即持续性动词。

buy 这个动作是短暂性，还是持续性的呢？

There is a special rule.

The robot has become a super robot since he got the cards.

The robot has been a super robot since he got the cards.

1 have arrived at/in,

have got to/reached,

have come/gone/moved to

3 have become

4 have closed/opened

5 have died

6 have left

7 have borrowed/bought

8 have joined

常见的短暂性动词和与之对应的持续性动词表达

have been in/at

have been

have been closed/open

have been dead

have been away from

have kept/had

have been a member of/

have been in

1. The robot has come home since this morning.

2. The boy’s brother has died since a year ago.

3. The boy and the robot have arrived at the office for 2

hours.

4. I have borrowed the robot for 10 days.

5. The boy has joined the Robot Club since he attended

the club fair.

Please correct the mistakes in the following sentences.

has been

has been dead

have been at

have kept

has been a member of / has been in

Final TaskTo: MumFrom: Stanley

Dear Mum,I have been in New York ___ a month now. I ____ ___(meet) my roommates. They’re from different countries. They are friendly. David and I _____ _____(play) a lot of basketball after school. We both enjoy ourselves. Jack has cooked us delicious meal ____ last Monday. I _____ _____(study) Maths with my roommates since three days ago. We ____ ____(see) many famous places of interest in the USA too. However, I haven’t visited the Time Square yet, and I haven’t done any shopping ____ I came here. I will do these things next week.Love,Stanley

have met

have played

since

have studied

for

have seen

since

Thank you for listening!