語法課情態(tài)動詞can should

1、 情態(tài)動詞can . should情態(tài)動詞有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。今天我們來學(xué)can和should.Can 1. 特點：情態(tài)動詞無人稱和數(shù)的變化；不能單獨使用，必須與其后的動詞原形構(gòu)成謂語。I can speak English. We can swim. He can sing.You can play the guitar. She can draw. They can dance. 2.概念：1

2、）表示能力（體力、知識、技能）。 e.g. Can you lift this heavy box? 你能舉起這個大盒子嗎？（體力） Mary can speak three languages. 瑪麗能說三種語言。（知識） Can you skate?你能滑冰嗎？（技能） 2）表示請求和允許。 -Can I go now? - Yes, you can. / No, you cant. 3）表示客觀可能性（客觀原因形成的能力）。 e.g. Theyve changed the timetable, so we can go by bus instead. This hall can hold

3、 500 people at least. 這個大廳至少能容納500人。 4）表示推測（驚訝、懷疑、不相信的態(tài)度），用于疑問句、否定句和感嘆句中。 e.g. Can this be true? This cant be done by him. How can this be true? 3.變否定句直接在can后加“not”I can not speak English. We can not swim. He can not sing. You can not play the guitar. She can not draw. They can not dance.4. 變一般疑問句直接

4、把can提前, 肯定回答用yes, 否定回答用no.注意can提前后首字母大寫例Can you speak English? Yes, I can. /No, I cant. Can you play the guitar? Yes, we can. / No, we cant. Can she draw? Yes, she can. /No, she cant. Can he sing? Yes, he can./ No, he cant. Can they dance? Yes, they can./ No, they cant.總結(jié)：情態(tài)動詞can，后面總是接動詞原形,沒有人稱和數(shù)的變化

5、.意思是”能,會”.用法口訣：情動can表能力, 和行為動詞不分離.不管主語如何變, can的模樣永不變.只要出現(xiàn)情動can, 動詞原形后面站.一般疑問can提前, 否定can后not添.Should1.should表示義務(wù)或責(zé)任建議或勸告。其意為“應(yīng)該”He should work harder. 他應(yīng)該更加努力。You should help your mother with the housework. 你應(yīng)該幫你母親做家務(wù)?！咀ⅰ縮hould表示推斷時，語氣較肯定，通常是指非?？赡艿氖?因為暗示有一定的事實依據(jù)或合乎常理)Should I wear a coat? 我要穿大衣嗎？2.s

6、hould 表示推斷。意為“應(yīng)該”、“可能” He should arrive soon 他可能很快就到了。The train should have already left. 火車大概已經(jīng)走了。The concert should be great fun. 音樂會應(yīng)該很有意思。3. should 用于征求意見主要用于第一人稱的疑問句形式Should I open the window? 我可以打開窗戶嗎？Where should I meet you tonight? 我今晚該到哪兒與你見面？What should we do now? 我們現(xiàn)在該干什么呢？4. should 表示謙遜或

7、委婉。通常與like, love, think, say, imagine等動詞連用 I should say shes over forty. 我想他有40多歲了。I should think its too expensive. 我看這太貴了。I should imagine it will take about three hours. 我想得花大約三個小時。5. should表示意外或驚訝 Its strange that he should come so late. 他竟然來這么遲真是奇怪。Im sorry that this should have happened. 我很遺憾竟

8、然發(fā)生這種事。6. 有時與why, who, how 等疑問詞連用 Why should you think that way? 你為什么會那樣想？How should I know? 我怎么會知道？練習(xí)：1.Can you dance? Yes, I .A. do B. can C.cant2.Can he write English? No, he .A. can B.cant C.does3.I ride a bike, but I drive a car.A. can, can B.cant, can C can, cant4.She can basketball.A.play B.playing C.plays5.They can play basketball after class.(改為一般疑問句,并作肯定和否定回答.)_they_ basketball after class? 肯定：_,they_. 否定_,they_.6.Lily can sing in English.(改為否定句) Lily_ _in English. 7.完成句子 貝蒂會說英語,但她不會說漢語。Betty English, she speak Chinese.8.那個女孩不會打網(wǎng)球。Th