情態動詞
二、“情態動詞+完成式” 1. “should（ought to）+完成式”表示本應該做某事而實際上沒有做。其否定式表示某種行為不該發生但卻發生了。 ①—i’ll tell mary about her new job tomorrow. — you________ her last week. （XX年福建卷） a. ought to tell b. would have told c. must tell d. should have told ②oh, i’m not feeling well in the stomach, i _____ so much fried chicken just now. （XX年上海春季卷） a. shouldn’t eat b. mustn’t have eaten c. shouldn’t have eaten d. mustn’t eat 2. “could+完成式”表示本來能夠做成某事的但結果沒能做成，含有遺憾的意味。 he paid for a seat, when he ______ have entered free. （XX年山東卷） a. could b. would c. must d. need 3. “needn’t+不定式的完成式”表示本來不必做某事而實際上做了某事。例如： you needn’t have watered the flowers, for it is going to rain.你本不需要澆花的，因為天就要下雨了。 — catherine, i have cleaned the room for you. — thanks. you ______ it. i could manage it myself. （XX年福建卷） a. needn’t do b. needn’t have done c. mustn’t do d. shouldn’t have done 三、常見的情態動詞 1. shall用于一、三人稱疑問句表示征求對方意見；用于二、三人稱陳述句表示說話人給對方的命令、警告、允諾或威脅等。 ①“the interest be divided into five parts, according to the agreement made by both sides，” declared the judge. （XX年重慶卷） a. may b. should c. must d. shall ②—excuse me, but i want to use your computer to type a report.