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第一PPT > PPT課件 > 英語課件 > 外研版八年級英語下冊 > 《Language in use》journey to space PPT課件

《Language in use》journey to space PPT課件

《Language in use》journey to space PPT課件 詳細(xì)介紹:

《Language in use》journey to space PPT課件《Language in use》journey to space PPT課件

外研版八年級英語下冊《Language in use》journey to space PPT課件,共31頁。

學(xué)習(xí)目標(biāo)

1. 復(fù)習(xí)本模塊出現(xiàn)的目標(biāo)詞匯、短語和句子。

2. 進(jìn)一步復(fù)習(xí)鞏固現(xiàn)在完成時的用法。

3. 能運用含already, just和yet的現(xiàn)在完成時表達(dá)已完成與未完的事情。

Language practice

I’ve just made a model spaceship.

Has it arrived yet?

Astronauts have already been to the moon. 

We have not found life on any other planets yet.

在現(xiàn)在完成時的句子中,already(已經(jīng))、just(剛剛)常用于肯定句,放在have和has的后面。yet(還、尚、仍然)常用于否定句和疑問句,放在have和has的后面,也可放在句末。

Look at these sentences.

The spaceship has gone to Mars.

It has gone there, but it has not come back yet.

Astronauts have been to the moon.

They went there and then they came back.

have/has been to與have/has gone to的區(qū)別:

have/has been to表示某人“去過某地,現(xiàn)在已經(jīng)回來了”。

have/has gone to表示某人“去某地了”,這個人已經(jīng)不在這里了。

語法總結(jié)

現(xiàn)在完成時

(1) 當(dāng)表示動作已經(jīng)完成,并對現(xiàn)在有一定影響時,我們一般用現(xiàn)在完成時。

同時,可分用just, already或yet加以強(qiáng)調(diào)或說明。例如:

I have just heard the news.   我剛聽到消息。

Astronauts have already been to the moon. 

宇航員已經(jīng)去過月球了。

He has just started to explore other planets. 

我們才剛剛開始探索其他行星。

可以看出,just 用來表示“剛剛”, already 用來表示“已經(jīng)”,兩者都用于肯定句中,一般是置于have / has 之后。

(2) 在否定句中則可用yet, 表示“還未”, 有“以后可以會”的含義。

例如:The scientists have not heard from it yet. Man has not discovered any life in space yet. 

科學(xué)家還沒收到回應(yīng),人類還沒有在太空發(fā)現(xiàn)其他的生命。

另外,在使用現(xiàn)在完成時的時候,要注意與一般過去時的區(qū)別。現(xiàn)在完成時在表達(dá)經(jīng)歷時只表示該事件是在現(xiàn)在之前的某一個時間里發(fā)生的,重點在于已完成動作對現(xiàn)在的影響。而一般過去時則表示在過去某一具體時間發(fā)生的事情。例如:

I have just been to London. I went there last month.

我剛?cè)ミ^倫敦,上個月去的。

I have already finished my homework. I finished it an hour ago. 

我已經(jīng)完成家庭作業(yè)了,一小時前完成的。

在沒有明確的過去時間狀語時,如何判斷該用現(xiàn)在完成時還是該用過去時呢?判斷的標(biāo)準(zhǔn)是看該行為是否對現(xiàn)在有影響,也就是說該句強(qiáng)調(diào)的是什么。試看以下對話:

A: Where have you put my book? I can’t find it. 

你把我的書放哪兒去了?我找不到。

B: I put it on your desk yesterday. 我昨天放你桌子上了。

該對話中,當(dāng)A 問對方把自己的書放在何處時,A 感興趣的是現(xiàn)在的狀態(tài),因此用現(xiàn)在完成時。但是B 回答時只是說明當(dāng)時放的位置,所以用一般過去時。

Homework

1. 復(fù)習(xí)重點單詞和短語。

2. 復(fù)習(xí)現(xiàn)在完成時并能熟練運用該時態(tài)描述有關(guān)太空之旅的內(nèi)容。

3. 預(yù)習(xí)下一模塊內(nèi)容。

... ... ...

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