英语Unit 3 Language in use .教学课件ppt

这是一份英语Unit 3 Language in use .教学课件ppt，共21页。PPT课件主要包含了祈使句，must，mustn’t，could，Stay away，Hide under，Do not use，Leave，Keep，chance等内容，欢迎下载使用。

祈使句表达说话人对对方的叮嘱、劝告、希望、禁止、建议、请求或命令等。祈使句一般以动词原形开头，无时态和数的变化。常见的句型如下：
1. 动词原形构成的祈使句 此类祈使句暗含的主语是yu，但通常省略。否定句往往由 d nt（dn't）或 never 开头。祈使句的句首或句末有时加 please，还可以加上称呼语，用逗号与句子主体隔开。例如：
Have a nice day!  祝你度过美好的一天！Dn't waste yur time!  别浪费时间了！Never be late again!  再也不要迟到了！Cme this way, please.  请走这边。
Please be quiet, bys!  男孩们，请安静！Make sure he's warm.  确保他不受凉。Dn't use the lift.  不要使用电梯。
2. let's 构成的祈使句 这类祈使句往往用于提出建议。例如： Let's spend this weekend in the cuntryside.  这周咱们到乡下度周末吧。 Let's take a taxi, shall we?  我们坐出租车好吗？
3. 无动词祈使句 在请求、命令和口号中，常用无动词祈使句，它实际上是省略了动词，从而使语句更简洁有力。例如：Just a minute, please!  请稍等！ This way, please!  请这边走！
二、情态动词 must/can/culd 表示推测
我们学习过情态动词 can 和 culd 表示“能够，可以”等意义的用法。can 和 culd 还可以表示对现在或将来的推测，意为“会, 可能”，但 can 表示推测时，往往用于否定句和疑问句。用于疑问句时，can 比 culd 表示的“可能性”要大；用于否定句时，cannt（can't）表示“不可能”。例如： Yu can't be serius! 你不是认真的吧！
culd 则可用于肯定句、否定句和疑问句。在以下例句中，can 和 culd 均表示可能：He culd be in pain. 他可能很疼。That culd be harmful! 那可能有害！Can/Culd this be true? 这有可能是真的吗 ?
情态动词 must 也可以表示猜测，意思为“一定，准是”，通常只用于肯定句。如课文中的例子： Betty, yu must knw!  贝蒂，你肯定知道！
请仔细对比下列一组句子：Wh sent the present? Can it be yur brther? 是谁送来的礼物啊？会是你哥哥吗？（询问可能性）
It must be yur brther. I saw him in yur rm just nw. 肯定是你哥哥，我刚才看见他在你的房间里。（语气强烈，表示非常肯定）It can't be my brther. He is still in France. 不可能是我哥哥，他还在法国呢。（表示不可能）
1.Cmplete the sentences with culd, must r mustn’t.1 It is dangerus. Yu _____ keep ut!2 These stairs are nt safe. Yu ________ use them.
3 The rcks are falling dwn. Yu ______ get hit.4 The river is t deep. Yu _______ swim in it.5 Betty _____ knw what t d because she did sme basic medical training.
2.Underline the crrect wrds t cmplete the first aid instructins.
1 Get / D nt get medical help immediately.2 Ask / D nt ask them where the pain is.3 Lift / D nt lift them because yu may drp them.4 Keep / D nt keep them warm.
3.Cmplete the pster abut earthquakes with the crrect frm f the wrds and expressins in the bx.
When there is an _________ frm the windws.2 __________ a table.3 __________ the lift.4 ______ the building quickly when the grund stps shaking.5 _____ calm.
4.Cmplete the cnversatin with the wrds and expressins in the bx.
Tny: Daming is training hard fr the big match.Lingling: Yes, the team has a gd (1)______ this year.Tny: Oh n, Daming’s (2)_________. He's dwn!Lingling: It lks like he's (3)_______.
Tny: Daming, what happened?Daming: It's my leg.Lingling: (4) ______ him with my cat.Tny: But dn't mve him. Let's wait fr smene with (5) _______ training.Lingling: OK.
5.Cmplete the news reprt with the crrect frm f the wrds in the bx.
clear inside pwer rck truble warn
Infrmatin is cming in that culd be (1) _________ because f heavy rain in the nrth .The gvernment is (2) peple abut falling (3) . Sme rads have a lt f rcks n them ,but peple are trying t (4) them quickly. In sme places there is n (5) .And peple must stay (6) t keep away frm falling rcks.
1.There are prblems everywhere because f rain. ( )2.The gvernment is warning peple abut an earthquake. ( )3.Sme rads in the muntains have a lt f rcks n them. ( )4.Peple are trying t clear the rcks ff the rads. ( )5.There is n prblem with pwer. ( )
Nw read the reprt again and check(√)the crrect sentences.
7 Read the passage and chse the crrect answer.
1.What’s the best title fr this passage?a)2004 Asian tsunami.b)A girl saves turists frm tsunami.c)Underwater did Tilly ntice?a)Water cming t the beach.b)Peple watching the water.c)Bubbles in the water.
3.What des her teacher think f Tilly?a) She’s lucky.b)She desn’t d silly things.c) She’s a clever student.
Arund the wrld
Special buildings in Japan Earthquakes are very cmmn in Japan.Many can cause a lt f damage. But nwthere are new ways f cnstructing buildingst make them safer and strnger during earthquakes. The Ykhama Landmark Twer is ne f the tallest buildings in Japan. It is heavy and strng. It sits n rllers. This means the earth can rise and fall beneath the building withut shaking it.