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can’t D. can。 mustn’t B. must。①I must go now.(主觀看法)② My mother is ill, so I have to go now.(客觀需要)*Have to與 have got to的區(qū)別: have got to雖然是have to的口語(yǔ)形式,但二者在用法上有嚴(yán)格的區(qū)別: have to的前面還可以用情態(tài)動(dòng)詞或助動(dòng)詞,而have got to卻不可以; have to的否定形式為don’t/doesn’t /didn’t +have to,疑問式為Do/Does/Did + 主語(yǔ) + have to…?而 have got to的否定形式是在have后加 not,疑問式把have提前。)*Must與 have to的區(qū)別: must表示的是說(shuō)話人的主觀看法,而have to則表示的是客觀需要。)(三)、have got to是 have to的口語(yǔ)形式。)(二)、have to 表示“必須”、“不得不”,例如:①He has to stay in bed for 3 or 4 days.(他必須臥床休息三四天。)3.)對(duì)于過(guò)去事實(shí)的推測(cè),我們用:must +have +過(guò)去分詞,例如:①It must have rained last night.(昨晚準(zhǔn)是下雨了。)2.)對(duì)于現(xiàn)在動(dòng)作的推測(cè),我們用:must +be + doing(行為動(dòng)詞),例如:①They must be cleaning their room.(他們準(zhǔn)是在打掃房間。分三種情況:1.)對(duì)于現(xiàn)在狀態(tài)的推測(cè),我們用:must +v.(狀態(tài)動(dòng)詞或系動(dòng)詞),例如:①He must be at home.(他準(zhǔn)在家里。) (不,你不必。而不用mustn’t來(lái)回答。)②You mustn’t be late for school.(你不應(yīng)該上學(xué)遲到。語(yǔ)氣比較強(qiáng)烈。)②Everyone must obey the rule.(人人必須遵守制度。語(yǔ)法:情態(tài)動(dòng)詞must、have to 和have got to情態(tài)動(dòng)詞must