must表示推測
2007-01-01 00:00
21.5 must表示推測 | ||
? | 1) must用在肯定句中表示較有把握的推測,意為"一定"。 2) must表對(duì)現(xiàn)在的狀態(tài)或現(xiàn)在正發(fā)生的事情的推測時(shí), must 后面通常接系動(dòng)詞be 的原形或行為動(dòng)詞的進(jìn)行式。 You have worked hard all day.You must be tired. 你辛苦干一整天,一定累了。(對(duì)現(xiàn)在情況的推測判斷) He must be working in his office. 他一定在辦公室工作呢。 比較: He must be staying there. 他現(xiàn)在肯定呆在那里。 He must stay there. 他必須呆在那。 3) must 表示對(duì)已發(fā)生的事情的推測時(shí),must 要接完成式。 I didn't hear the phone. I must have been asleep. 我剛才沒有聽到電話,我想必是睡著了。 4) must表示對(duì)過去某時(shí)正發(fā)生的事情的推測,must 后面要接不定式的完成進(jìn)行式。 ---Why didn't you answer my phone call? ---Well, I must have been sleeping, so I didn't hear it. 5) 否定推測用can't。 If Tom didn't leave here until five o'clock, he can't be home yet. 如果湯姆五點(diǎn)才離開這兒,他此時(shí)一定還未到家。 |