非常不错的情态动词课件,很到位,符合任何高中学生使用
a)表示主观义务或者责任：必须 have to表示一种客观义务和责任:只好，不得不 We must study hard so as to have a bright future. We have to work hard ,otherwise we will lose the job. 疑问句呢？ He doesn`t have to worry about his life. 请注意下列句子的回答： ---Must we hand in our exercises today ? ---Yes,you must. ----No,you needn`t/don`t have to.(mustn`t只有不准之意) b)偏要，硬要 -----How old are you,madam ? -----If you must know,I`m twice my son`s age.C.100%肯定的猜测 Tom must be in tears,isnt he? Tom must have broken the vase deliberately just now,didnt he?