Example sentence
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It must be in here.
それはここにある に違いない。
English grammatical rules
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Must: To express a conclusion
Must can be used to express the conclusion
that something is certain or highly possible.
If A is bigger than B, and B is bigger than C,
then A must be bigger than C.
- There is the doorbell. That must be the postman.
Must in questions and negatives
Must is not often used to express certainty
in questions and negative clauses.
In questions we use can.
- Somebody is knocking at the door. Who can it be?
- (NOT Who must it be?)
we generally use cannot/can't to say
that something is certainly not the case.
- It can't be your mother. She is in New York.
mustn't is normal in question tags after must, and in negative questions.
- It must be nice to be a bird, mustn't it?
日本語解説
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助動詞「must（～にちがいない）」
must には
「～しなければならない」のほかに
「～にちがいない」という意味もあります。
この意味で使うときには
must be の形でbe動詞がくることが多い。
- She must be hungry.
- 彼女はお腹を空かせているに違いありません。
- It must be true.
- それは本当であるに違いない。
- He must know it.
- 彼はそのことを知っているに違いない。
- There must be something at the back of this matter.
- この事件の裏に何かあるに違いない。
- There must be something wrong with this machine.
- この機械はどこかおかしいにちがいない。
- His house must be somewhere near here.
- 彼の家はどこかこの近くにあるにちがいない。
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