肯定:must/may/might + have been否定:can/could + not + have been/done 疑问:Can/Could + sb. + have been/have done 注意:表示推测(可能性从大到小):must,can,could,may,might。 They might have finished the work by now. Exercises:(A)相关知识点: 试题来源: 解析 句型 动名词 实义动词 被动...
·If he had time, he would attend themeeting. (fact: He does not have time, so he will not attend the meeting.)·If they didn’t take physical exercisesevery day, they wouldn’t be so healthy. (fact: They take physical exercisesevery day, so they are very healthy.)·If...
(2)have to 表示由于客观原因而“不得不、必须”做某事，有迫不得已之意，可用于多种时态：My parents aren't in, I have to stay at home to look after my young sister.父母不在家，我不得不在家照顾妹妹。She had to go to school by bus yesterday because her bike was broken.昨天自行车坏了，...
A.would B.should C.could D.might2.If we the other road, we might have arrive d here in time for the meeting. A.take B. h a d taken C.took D. have taken3. If you har d before, you a college student now. A. h a d studied: woul d have been B. h a d studied; woul ...
He must have a car now. （现在）他一定有辆小汽车。He must be doing his exercises in the classroom.（正在进行）他一定在教室里做练习。He must have finished the work.（过去发生）他一定已完成了工作。 注：must表示推测时很少用于将来的情况。一般不用He must come tomorrow.可用It`s ce...
But for their help, wecould not have finished the program in time. （高考真句）要不是他们的帮助，我们不可能按时完成这个项目。句型10until直到……时候not … until …直到……才……The weatherman said the sun wouldn’t come out until next week.（2016全国）气象预报员说直到下周太阳才会出来。Henr...
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Four years before COVID, the UK had carried out secret pandemic preparedness exercises for both flu and coronavirus outbreaks. A detailed report on the flu exercise was compiled, but public health officials have told the COVID inquiry that the coronavirus drill wasn't acted on...
除ought, used, have后跟不定式外,其他情态动词一律跟动词原形。情态动词主要有:can/could, may/might, must, ought to, used to, need, dare, shall/should, will/would, have to等。 (一)情态动词的特征 (1)没有人称和数的变化。 (2)大部分情态动词有过去式:...
Little Six didn't have a strong body, 6 he had a strong will. He decided 7 he would get stronger. He would do exercises and flap（拍动）his wings every day.Every morning, Little Six would rise 8 the sun even came up. When his brothers and sisters woke, Little Six had already ...