Unit 10 I've had this bike for three years能正确使用现在完成时询问并表达持续性动作或状态。（共有PPT18张）

(共18张PPT)
课题：I’ve had this bike for three years.难点名称：能正确使用现在完成时询问并表达持续性动作或状态人教版八年级下册Unit 10目录CONTENTSLead-in Jeff’ s Yard sale
How long has Jeff
had his bike
Jeff has had his bike for 3 years.
Jeff has had his bike since 3 years ago.
Jeff has had his bike since 2017.
Jeff has had his bike since he studied here in 2017.
探究：延续性与非延续性动词
2020
2011
2017
3 years
How long have you had this scarf？
I have had it since … .
I have had it for … .
2020
2011
2016
4 years
scarf
复数scarves
I have had it since … .
Jeff
Lucy
How long have you had that board game over there
2020
2011
9 years
I have had it since I was a child.
I have had it for … .
board game
I used to play it with my friends.
It brings back sweet memories.
I have had it since … .
此用法需注意两点：
1）常与for, since引导的时间段的时间状语连用。
2）动词使用延续性动词。因为瞬间动词在肯定句、疑问句中不能和时间段连用。
现在完成时表示从过去一直持续到现在的动作或状态，并可能还将持续下去。简称“延续用法”
Present Perfect Tense
现在完成时
1. for +一段时间
　　　　 e.g: for 8 years
2. since +过去的时间点
e.g: since 1999/ last spring
3. since + 一段时间+ ago
e.g: since 23 years ago
4. since + 从句（一般过去时态）
Since I came here four weeks ago.
since , for 的用法:
since＋一段时间＋ago＝for＋时间段;
since two weeks ago
=for two weeks
I have kept the library book for a week.
= I have kept the library book since a week ago.
在现在完成时态中，for与since引导的时间
状语可以相互转换。
1 He has become a doctor.他已经成为一名医生
He has been a doctor for five years.他当医生已经五年了。
2 His grandfather has died.他爷爷已去世了。
His grandfather has been dead for ten years.他爷爷已经去世10年了。
3 The film has begun.电影已经开始了。
The film has been on for five minutes.电影已经开始5分钟了。
动词使用延续性动词
It is + 时间段 +since +一般过去时的句子.
1.他的爷爷已经去世2年了。
2.Nick参军三年了。
3.他离开深圳好长时间了。
It is 2 years since his grandpa died.
It is 3 years since Nick joined the army.
It is a long time since he left Shenzhen.
含有for，since的现在完成时的用法歌诀: 过去的动作或状态，一直持续到现在，for,since 把时间带。
歌诀
1. 转换为相应的延续性动词，用于现在完成时。
borrow — keep
buy — have
put on — wear
catch a cold — have a cold
get to know — know
get to sleep — sleep
非延续性动词和延续性动词之间的转换
2. 转化为“be + 形容词/副词/介词/名词”
begin / start — be on
go out — be out
close — be closed
open — be open
get to/arrive/reach — be (in)
die — be dead
leave — be away
1、你来晚了，电影已放了10分钟了。
A: You are late. The film for
10 minutes.
B: You are late. The film since
10 minutes .
C: You are late. It ten minutes since the
film .
D: You are late. The film 10
minutes .
has been on
is
began/started
began/started
ago
Exercise
has been on
ago
2、Linda 已经感冒4、5天了。
A: Linda ___ ______ a cold _____ 4 to 5 days.
B: It _____4 to 5 days since Linda ________ a cold
C: Linda ________a cold 4 or 5 days ______
3、你来晚了，火车已经开走了20分种了。
A: You’re late. The train ____ ______ ______
for 20 minutes.
B: It ____ 20 minutes since the train ______.
C: The train _____20 minutes ________ .
has been away
is
left
left
ago
has had
for
is
caught
caught
ago
1. for +一段时间
　　　　
2. since +过去的时间点
3. since + 一段时间+ ago
4. since + 从句（一般过去时态）
Summary
现在完成时
-----“延续用法”
主语+have/has +P.P（延续性动词）
+
Thank you!