第一证书unit3.1.pptVIP

word stress 双名复名重在前 双动重音在后面 双音节词重倒二 多音节词重倒三 动副介词前缀轻 后缀有i重在前 modal verbs should= an obligation I should help my mother do some housework. must和have to的用法 情态动词＋不定式完成式的结构和用法 There’s no light in the room. They must have gone to bed. You should have come here a little earlier. I ought to have sent him to school. He ought not to have thrown the old clothes away. I dressed very warmly for the trip, but I neednt have done so. The weather was hot. We could have finished the work ahead of time. 我们本来是能够提前完成工作的。 We couldn’t have finished the work ahead of time without your help. 没有你们的帮助我们是无法完成这项工作的。 They can’t have gone skiing last winter, for there was little snow in the mountain. —There were five people in the car, but they managed to take me as well. —It couldn’t have been a pleasant journey. * 双音节名词的重音一般在第一个音节上，即倒数第二个音 节上。 ‘pic-ture, ‘com-rade, ‘win-dow, ‘part-ty 2. 复合名词的重音一般也在第一个音节上。 ‘class-room, ‘black-board, ‘foot-ball, ‘some-one 3. 双音节动词重音一般在第二个音节上。 re-‘pair, be-‘gin, pre-‘pare, ex-‘plain 有三个或三个以上音节的词，重音多在倒数第三个音节上。 ‘fa-mi-ly, ‘ex-er-cise, uni-‘ver-si-ty 5. 一般来讲，词的重音不因加后缀而改变。 cor-‘ rect, cor-‘rectly, ‘beauty, ‘beautiful 6.以-tion 或 –sion 结尾的词，其重音一般在-tion / - sion之前的音节上。 re-‘vision, ‘sta-tion, pro-nun-ci-‘a-tion 7.动词、副词、介词等的前缀一般要轻读。 re-‘port, re-‘cord, to-‘day, a-‘round, a-‘bout, be-‘fore 8.单词后缀含字母i时，该词重读音节必在i前边的那个 音节上。 -ical---‘che-mical po-‘li-tical -ian--- mu-‘si-cian ‘me-dian -tive---‘ac-tive pre-‘ven-tive -ic--- he-‘ro-ic au-to-‘ma-tic -ity---o-ppor-‘tu-nity -ion---in-‘ven-tion -ial--- e-‘ssen-tial -ious --- in-‘fec-tious The speaker is telling him / herself to do something. (Obligation comes from the speaker.) b. Someone else is telling the speaker what to do. (The obligation doesn’t come from