人教版八年级下册英语unit6课件.ppt

Unit 6 How long have you been
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words
collect
shell
marathon
pair
skate
since
Hilltop school
raise
several
skater
收集;搜集
贝壳;壳
马拉松赛跑;马拉式活动
一对;一双
溜冰鞋
自从;自……以来
山顶学校
筹集;筹募
几个的;数个的
溜冰者
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have / has是助动词
been是be的过去分词
表示从过去开始一直持续到现在的动作,
并有可能持续下去.
时态-现在完成进行时
(一)
构成形式:
have / has been + Ving
for +一段时间
have / has been + doing sth + since +过去的时间点
since + 从句(一般过去时)
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与过去时的比较:
watched TV for three hours.
我看了三小时的电视.
(我现在没有看电视了)
have been watching TV for three hours.
我看了三小时的电视.
(我现在仍然在看电视)
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例句 1
我已经学了5年的英语了.
I have been learning English for 5 years.
例句 2
他已经集邮10年了.
He has been collecting stamps for 10 years.
He has been collecting stamps since 10 years ago.
He has been collecting stamps since 2002.
画线部分提问:
How long has he been collecting stamps?
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引导时间的介词for与since的区别
for
since
表示时间的持续
for + 时间段
表示“自从过去某一时间点以来”
since + 过去的时间点
强调一段时间
强调动作或状态
一直延续到现在
( for与since引导的短语用how long提问)
从句
for
five minutes
ten days
five years
since
May 1, 2003
8:00
he was seven years old
seven years ago
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I started teaching English in 2010.
I am still teaching English now.
How long have you been teaching English?
I have been teaching English
for 2 years.
Teach English
2010
Have been teaching English
now
2 years
Teach English
24 years old
(Since I was 24.)
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sam started skating at 9 am.
He is still skating now.
How long has he been skating?
He has been skating
for 4 hours.
skate
9
Have been skating
now 1
4 hours
skate
(since 9 o’clock.)
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