中职英语外研版 (2021)拓展模块Grammar in Use授课课件ppt

这是一份中职英语外研版 (2021)拓展模块Grammar in Use授课课件ppt，文件包含Unit7第4课时GrammarinUse课件中职专用高二英语外研版2021拓展模块pptx、Unit7第4课时GrammarinUse教案中职专用高二英语外研版2021拓展模块docx等2份课件配套教学资源，其中PPT共15页， 欢迎下载使用。
Grammar in Use
Read the sentences and pay attentin t the underlined parts.
● 1. When I was yung, even taking a pht was a big thing... ● 2. Our life has changed s much because f high technlgy. ● 3. I was washing clthes by the river.
Present perfect tense
Past simple tense
1. I have bught a cmputer.2. I bught a cmputer .
There are tw sentences ,tell me the differences.
Present perfect tense
Can yu analyze the tenses ?
Past simple tense
一、 相同点：现在完成时和一般过去时所表示的动作都发生在过去。 I have seen the film. 我看过这部电影。 I saw the film three days ag. 三天前我看了这部电影。
二、 不同点：1. 侧重点不同 一般过去时:表示过去某时发生的动作或存在的状态，强调动作。 现在完成时: 发 生在过去，但强调过去的事情对现在的影响，强调影响。Mr Green has bught a new cmputer.格林先生买了一台新电脑。(强调的是格林先生现在有了一台新电脑)Mr Green bught a new cmputer yesterday.格林先生昨天买了一台新电脑。(强调的是格林先生买新电脑的时间是昨天)
2. 时间状语不同一般过去时常与具体的时间状语连用，而现在完成时通常与模糊的时间状语连用，或无时间状语。 一般过去时的时间状语：yesterday, last week，时间段+ag, in1980, in Octber, just nw this mrning等，皆为具体的时间状语。  现在完成时的时间状语：fr, since, s far, ever, never, just, yet, till/until, up t nw, in past years, already, recently, lately 等，皆不确定的时间状语。 
三、Present perfect tense和past simple tense的选用原则:
1.句子中含有fr或since等引导的短语或句子时，谓语只能用延续性动词。
(错）She gt married fr 10 years.
（对）She has been married fr 10 years.
2 句子中如有过去时的时间状语（如yesterday, last week, in 1960等）时，不能使用现在完成时，要用一般过去时。  （错）Tm has written a letter t his parents last night.  （对）Tm wrte a letter t his parents last night. 
3 . since 从句中谓语动词多用一般过去时，而主句谓语动词用现在完成时；如果主句单纯表示一段时间，可用一般现在时代替现在完成时。eg, 自从第一次见面以来，我们一直是朋友。 We have been friends since we first met.从我们上次见面到现在已有六年了。It is six years since we last saw each ther.
4. 在时间或条件状语从句中， 须用现在完成时代替将来完成时。eg, 等雨停了之后，我领你去看看我们的花园。 I will shw yu ur garden when the rain has stpped.
5. 在含有序数词及形容词最高级的句型中一般用现在完成时。这是我读过的最有趣的书。This is the mst interesting bk that I have ever read.
Cmplete the sentences with the crrect frm f the wrds in brackets.
1. Tm ___________ (listen) t 200 sngs n this app s far. 2. I ________ (delete) the file frm the cmputer system yesterday. 3. My smartphne ran ut f pwer when I ________________ (cnfirm) my reservatin. 4. Nick ____________ (read) a digital bk nline when I came in. 5. Our village ______________ (change) a lt since he came.
has listened
was cnfirming
was reading
has changed