人教版八年级英语下册《I've had this bike for three years》SectionA PPT教学课件(第3课时)，共40页。ObjectivesTo learn the usage of for and since.To use the Grammar Focus sentences to create simple conversation.To learn new word: hometown…ReviewGroup WorkYou’re having a yard sale. What would you do with the money you raise?Grammar FocusHow 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表示从过去已经开始持续到现在的动作或状态，可以和表示“从过去某一时刻延续到现在的一段时间状语”连用，如“for+时间段”、“since+过去时间点”、“since+过去时的从句”、“since+一段时间+ago”。且for与since引导的时间状语可以相互转换。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．自从1990年以来我就住在这里。 I haven’t seen him for three years.我三年没有看见他了。 She’s been at this school since five years ago. 自从五年前她就在这个学校。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。 for 和 since 在现在完成时中的应用for与since都能与现在完成时连用，但区别较大：（1）for后须接“时间段”e.g. He has studied English for five years.他学英语5年了。（2）since后须接“时间点”e.g. He has studied English since 1999.他从1999年开始学英语。（3）二者可以转换 for + 一段时间= since + 一段时间 + ago e.g. He has been here for five weeks.= He has been here since five weeks ago.他到这儿已经有五个星期了。（4）since能引导时间状语从句（主句用现在完成时，从句用一般过去时），而for则不能。e.g. He has taught here since he came to China.自从他来到中国就在这儿教书。（5）现在完成时常用句型：①It is (has been) +时间段+ since +时间状语或从句 e.g.It is four days since last Friday.从上周五到现在已经四天了。It has been two years since Jim came to Beijing.吉姆来北京已经两年了。HomeworkReview the Grammar Focus and tell the differences between for and since.Then make sentences with them.... ... ...关键词：I've had this bike for three years PPT课件免费下载，.PPTX格式； 本作品中主体文字及图片可替换修改，文字修改可直接点击文本框进行编辑，图片更改可选中图片后单击鼠标右键选择更换图片，也可根据自身需求增加和删除作品中的内容，源文件无水印。如认为该内容涉嫌侵权，可通过邮件提出书面通知，我们将及时处理。