Unit 27 Must (You must be tired, etc.)

  A     Must (not)

  •     A: My house is next to the freeway.
        B: It must be very noisy.
  • must 는 「…임에 틀림없다」의 강한 추측을 표현합니다.
    • You’ve been traveling all day. You must be tired.
      (Traveling is tiring and you’ve been traveling all day, so you must be tired.)
    • “Jim is a hard worker.”  “Jim? You must be joking. He’s very lazy.”
    • I’m sure Sally gave me her phone number. I must have it somewhere.
  • must notmust 의 부정형으로 「…이 아님에 틀림없다」의 의미입니다.
    • Their car isn’t outside their house. They must not be home. (= They must be out)
    • Brian said he would be here by 9:30. It’s 10:00 now, and he’s never late. He must not be coming.
    • They haven’t lived here very long. They must not know many people.
  • must 의 사용 형태:
    I/you/he (etc.) must (not) be (tired / hungry / home, etc.)
    be (doing / coming / joking, etc.)
    do / get / know / have, etc.

 § must 는 확신있는 추정과 윤리·도덕적인 필연성인 「틀림없이 …일 것이다」를 표현하고, 이 뜻의 부정으로는 must not 「…이 아님에 틀림없다」를 사용하며 보통 축약(mustn’t)하지 않습니다.

  B     Must (not) have done

  • must 가 현재의 사실에 대한 추측인 것에 비해 must (not) have done 은 과거의 사실에 대한 강한 추측을 표현합니다. 「…이었음에(…이 아니었음에) 틀림없다」의 의미입니다.
    • “We used to live close to the freeway.”  “Did you? It must have been noisy.”
    • There’s nobody at home. They must have gone out.
    • I’ve lost one of my gloves. I must have dropped it somewhere.
    • She walked past me without speaking. She must not have seen me.
    • Tom walked into a wall. He must not have been looking where he was going.
  • must (not) have 의 사용 형태:
    I/you/he (etc.) must (not) have been (tired / hungry / noisy, etc.)
    been (doing / coming / looking, etc.)
    gone / dropped / seen, etc.

  C     Can’t and must not

  • It can’t be true = 사실일 리가 없다.
    • How can you say such a thing? You can’t be serious!
  • can’tmust not 의 비교:
    • A: Joe wants something to eat.
      B: But he just had lunch. He can’t be hungry already. (= it’s impossible that he is hungry because he just had lunch)
    • A: I offered Bill something to eat, but he didn’t want anything.
      B: He must not be hungry. (= I’m sure he is not hungry – otherwise he would eat something)

 § can’t be 의 과거형은 「…이었을 리가 없다」를 표현하는 cannot have (been) 입니다.

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