人教版八年級(jí)英語(yǔ)下冊(cè)《I've had this bike for three years》SectionA PPT教學(xué)課件(第3課時(shí))，共40頁(yè)。
Objectives
To learn the usage of for and since.
To use the Grammar Focus sentences to create simple conversation.
To learn new word: hometown…
Review
Group Work
You’re having a yard sale. What would you do with the money you raise?
Grammar Focus
How long have you had that bike over there?
I’ve had it for three years.
How long has his son owned the train and railway set?
He’s owned it since his fourth birthday.
Have you ever played football?
Yes, I did when I was little, but I haven’t played for a while now.
Present Perfect Tense
表示從過(guò)去已經(jīng)開始持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài)，可以和表示“從過(guò)去某一時(shí)刻延續(xù)到現(xiàn)在的一段時(shí)間狀語(yǔ)”連用，如“for+時(shí)間段”、“since+過(guò)去時(shí)間點(diǎn)”、“since+過(guò)去時(shí)的從句”、“since+一段時(shí)間+ago”。且for與since引導(dǎo)的時(shí)間狀語(yǔ)可以相互轉(zhuǎn)換。
e.g. My uncle has worked at this factory for ten years.
= My uncle has worked at this factory since ten year ago.
I’ve lived here since 1990．
自從1990年以來(lái)我就住在這里。
I haven’t seen him for three years.
我三年沒(méi)有看見他了。
She’s been at this school since five years ago.
自從五年前她就在這個(gè)學(xué)校。
含有for，since的現(xiàn)在完成時(shí)的用法歌訣: 過(guò)去的動(dòng)作或狀態(tài)，一直持續(xù)到現(xiàn)在，for、since 把時(shí)間帶。
for 和 since 在現(xiàn)在完成時(shí)中的應(yīng)用
for與since都能與現(xiàn)在完成時(shí)連用，但區(qū)別較大：
（1）for后須接“時(shí)間段”
e.g. He has studied English for five years.
他學(xué)英語(yǔ)5年了。
（2）since后須接“時(shí)間點(diǎn)”
e.g. He has studied English since 1999.
他從1999年開始學(xué)英語(yǔ)。
（3）二者可以轉(zhuǎn)換 for + 一段時(shí)間
= since + 一段時(shí)間 + ago
e.g. He has been here for five weeks.
= He has been here since five weeks ago.
他到這兒已經(jīng)有五個(gè)星期了。
（4）since能引導(dǎo)時(shí)間狀語(yǔ)從句（主句用現(xiàn)在完成時(shí)，從句用一般過(guò)去時(shí)），而for則不能。
e.g. He has taught here since he came to China.
自從他來(lái)到中國(guó)就在這兒教書。
（5）現(xiàn)在完成時(shí)常用句型：
①It is (has been) +時(shí)間段+ since +時(shí)間狀語(yǔ)或從句 e.g.
It is four days since last Friday.
從上周五到現(xiàn)在已經(jīng)四天了。
It has been two years since Jim came to Beijing.
吉姆來(lái)北京已經(jīng)兩年了。
Homework
Review the Grammar Focus and tell the differences between for and since.Then make sentences with them.
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