must

/mʌst/ modal v.
标准词条 CET-4CET-6IELTS
一句话记住

必须；一定；（推测）必定

释义与例句

modal v. 必须；一定；（推测）必定
used to say that something is necessary or required, or that something is very likely to be true
  1. All visitors must wear a safety helmet.
    所有访客都必须佩戴安全帽。
  2. You must not disclose this information to anyone.
    你不得向任何人透露这些信息。
展开其余 1 条例句
  1. She must be tired after such a long journey.
    经过这么长的旅途，她一定累了。

词源与构词

记忆钩子 must not 表示“禁止”；表示“不必”用 need not 或 don't have to，二者含义不同。

词族与关联词

易混词（形近或义近，注意区别）
  • have to 必须；不得不
    must 常表达说话人的强烈要求、规则或主观必要性；have to 常指外部规定或客观情况造成的义务，并有过去式、将来式等更多形式。must not 是禁止，don't have to 是不必。
    We have to submit the form by Friday. 我们必须在周五前提交表格。
常见搭配
  • must do something 必须做某事
    You must check your details before submitting the application. 提交申请前，你必须核对自己的信息。
  • must not 禁止；不得
    Passengers must not stand near the doors. 乘客不得站在车门附近。
  • must have done 一定已经做了
    They must have left early because the lights are off. 灯都关了，他们一定很早就离开了。