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DON'T HAVE TO vs. MUSTN'T   
〜しなくてもいい vs. 〜してはいけない


To say that you don't have to do something means that it isn't necessary to do it, but that you can choose to do it or not.

To say that you mustn't do something means that you shouldn't do it, that it is important not to. You are not really given a choice.

(Be careful: We use the word "to" in the pattern "don't have TO do"; but we say, "mustn't do", NOT "mustn't TO do".)

don't have to は、しなくてもいいという意味です。するかしないかを自分で選択することができます。

mustn't は、してはいけないという意味です。するかしないかの選択の余地はありません。

注意: don't have TO do にはtoがつきますが、mustn't TO do とは言いません。 mustn't do と言います。
 
 
1.You don't have to have a driver's license in order to ride a bicycle.
2.You mustn't drive a car without a driver's license.
3.Guests don't have to pay for their hotel room when they check in. Most people prefer to pay when they check out.
4.Guests mustn't forget to check out before they leave the hotel.
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