must,have to和have got to

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  这是三个易混淆的词,都有“必须”的意思,但是在用法和意义上都有很大的不同。例如,must可以表示主观的义务和必要。主要用于肯定句和疑问句,表示肯定的猜测;而have to表示一种客观的需要,同时,have to与havegot to常可以互换。
  
  一、must的用法
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