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arrived . I told her I hadn’t had supper yet. Giving advice with ‘should’, ‘ought to’, ‘had better’, ‘have to’, and ‘must’ should和 ought to 用 should/ought to可以表示“勸說”或“督促”, 和 must 一樣, 但三者語氣強(qiáng)弱不同。 用 should語氣比較肯定一些, 說話人的主觀信心要強(qiáng)烈一些。 用 ought to則口氣上不那么堅(jiān)定。 用 must則在口氣上最強(qiáng)烈。 . You must do your homework. You should mind your own business. I ought to write to him today. must與 have to must表示“必須”,側(cè)重于說話人的主觀意志。 have to表示“必須”, 側(cè)重于客觀的需要,含有“不得不”的意味。 had better(??s寫為’ d better) ,是一固定詞組, 表示“最好”, 用于表示對(duì)別人的勸告、建議或表示一種愿望。 had better后面加動(dòng)詞原形 ,即 had better do , 句子無論是何種時(shí)態(tài), had better形式不變。 had better的否定形式 為 had