01情態(tài)動(dòng)詞的基本用法must, can, could, may, might, ought to, had better等只作情態(tài)動(dòng)詞;need, dare用于否定句、疑問句是情態(tài)動(dòng)詞,用于肯定句是行為動(dòng)詞;shall, should, will, would既可作情態(tài)動(dòng)詞也可作助動(dòng)詞;have to, used to, would like to, would rather具有情態(tài)動(dòng)詞的某些特征。 【考例1】 My room is a mess, but I ______ clean it before I go out tonight. I can do it in the morning. A. daren’t B. shouldn’t C. needn’t D. mustn’t 解析:C。 句意:我的房間很亂,但是在今晚外出之前我不需要打掃它,我可以明天早晨打掃。daren’t不敢;shouldn’t不應(yīng)該;needn’t不需要,沒必要;mustn’t絕不能。 【考例2】 Samuel, the tallest boy in our class, ______ easily reach the books on the top shelf. A. must B. should C. can D. need 解析:C。 句意:塞繆爾是我們班里最高的男孩,他可以輕松夠到書架頂層的書。must一定;should應(yīng)該;can能夠;need需要。 【考例3】 You ______ be careful with the camera. It costs! A. must B. may C. can D. will 解析:A。 因?yàn)楹苜F重,所以“必須”要小心。 02情態(tài)動(dòng)詞表推測的用法1. 對(duì)現(xiàn)在或?qū)淼耐茰y用“情態(tài)動(dòng)詞+動(dòng)詞原形”。 2. 對(duì)過去事情的推測,用“情態(tài)動(dòng)詞+have+done”。 【考例1】 You ______ be Carol. You haven’t changed a bit after all these years. A. must B. can C. will D. shall 解析:A。 這么多年沒變,見后猜測一定是卡羅。 【考例2】 George _________ too far . His coffee is still warm . A. must have gone B. might have gone C. can't have gone D. needn't have gone 解析: C。 句意:喬治不可能走得太遠(yuǎn),他的咖啡還熱著呢。can’t have done是對(duì)過去的否定推測。 【考例3】You ______ feel all the training a waste of time, but I’m a hundred percent sure later you’ll be grateful you did it. A. should B. need C. shall D. may 解析:D。 你(目前)可能會(huì)覺得所有的訓(xùn)練是在浪費(fèi)時(shí)間,但我完全相信日后你會(huì)感激你曾經(jīng)的付出。 【考例4】Harry is feeling uncomfortable. He ______ too much at the party last night. A. could drink B. should drink C. would have drunk D. must have drunk 解析:D。 哈利感覺不舒服。昨晚的聚會(huì)上他肯定喝得不少。對(duì)過去發(fā)生事情的肯定推測,用must have done。 03習(xí)慣用法1. “情態(tài)動(dòng)詞can和could的否定式+比較級(jí)”表達(dá)最高級(jí)。 2. “can’t…+too+形容詞或副詞”或“can’t+形容詞或副詞+enough”表示“無論怎么……也不(過分)……”,“越……就越好”。 3. “may well+動(dòng)詞原形”意為“能,很可能”,相當(dāng)于be very likely to。 4. “may as well + 動(dòng)詞原形”意為“最好,滿可以,倒不如”,相當(dāng)于had better。 5. “cannot but + do sth”表示“不得不,只好”。 【考例1】 I ______ myself more—it was a perfect day. A. shouldn’t have enjoyed B. needn’t have enjoyed C. wouldn’t have enjoyed D. couldn’t have enjoyed 解析:D。 我玩得再開心不過了,這真是完美的一天。此處couldn’t與比較級(jí)more搭配表達(dá)最高級(jí)的意義;couldn’t此處表推測“不可能”。 【考例2】No one ______ be more generous; he has a heart of gold. A. could B. must C. dare D. need 解析:A。 沒有人比他更慷慨大方了,他有一顆金子般的心。could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,而且本句中還包含了“否定詞+比較級(jí)”表達(dá)最高級(jí)的一種用法,表示他是最慷慨大方的。 【考例3】I ______ thank you too much for all your help to my son while we were away from home. A. won’t B. can’t C. can D. will 解析:B。 我再怎么感謝你對(duì)我兒子的幫助都不為過。“can’t…+too+形容詞或副詞”表達(dá)最高級(jí)。 【考例4】 Liza ______ well not want to go on thetrip — she hates traveling. A. will B. can C. must D. may 解析:D。 麗薩不喜歡旅行,所以她很可能不旅行了。may well 和 might well意為“很可能”, 加強(qiáng)推測的語氣,表示具有較大的可能性。 |
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