must/have to:
① 表示必须、必要,在回答问句时,如果是否定的,必须用needn’t, don’t have to
eg. ---- Must I finish my homework before dinner?
---- Yes, you must.
---- No, you don’t have to / you needn’t.
② must是说话人的主观看法, 而have to则强调客观需要,have可根据时态人称的变化而变化
eg.That film is interesting,I really must go to watch.
You have to get to school before 8 am.
③ 表示推测、可能性(只用于肯定的陈述句)
eg.You must know that,you are a teacher.
dare/need:
① dare作情态动词用时, 常用于疑问句、否定句和条件从句中
eg.How dare you say that to me?
② need 作情态动词用时, 常用于疑问句、否定句
eg. Need I finish my homework before dinner?
③ dare和 need也可以做实义动词来用,独自充当谓语。
eg.The little girl dares to go to school by herself.
好了以上就是这两组词的用法总结了,内容不少,大家掌握得如何啊?情态动词是一种非常常用的辅助词,尤其是在口语中,很多时候你甚至不用说完一个句子,只要说个情态动词,对方就能马上懂你的意思,情态动词本身就因为西方社会的各类习俗而有了许多约定俗成的内涵意义,所以各位学习者们一定不能忽视这个知识点。
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