Must vs Have to

Kita gunakan ‘must‘ untuk menunjukkan kalau kita itu yakin akan sesuatu dan sesuatu itu pasti benar adanya. Biasanya diikuti dengan alasan yang kuat.

• There’s no heating on. You must be freezing.
• You must be worried that she is so late coming home.
• I can’t remember what I did with it. I must be getting old.
• It must be nice to live in Florida.

Kita juga menggunakan ‘must‘ untuk mengekspresikan keharusan yang kuat. Artinya pembicara hampir sangat setuju akan keharusan tersebut.

• I must go to bed earlier.
• They must do something about it.
• You must come and see us some time.
• I must say, I don’t think you were very nice to him.

Kita gunakan ‘have to‘ untuk mengekspresikan keharusan yang sangat kuat. Keharusan yang timbul karena faktor luar.

• I have to arrive at work at 9 sharp. My boss is very strict.
• We have to give him our answer today or lose out on the contract.
• You have to pass your exams or the university will not accept you.
• I have to send a report to Head Office every week.

Dalam British English, digunakan ‘have got to‘ yang artinya sama dengan ‘have to’.

• I’ve got to take this book back to the library or I’ll get a fine.
• We’ve got to finish now as somebody else needs this room.

Kita bisa juga gunakan ‘ will have to‘ untuk membicarakan keharusn. Sama seperti Must, keharusan yang bersumber dari diri pribadi yang menyatakan “memang” sesuatu itu harus.

• I’ll have to speak to him.
• We’ll have to have lunch and catch up on all the gossip.
• They’ll have to do something about it.
• I’ll have to get back to you on that.

Mustn’t artinya dilarang.

• We mustn’t talk about it. It’s confidential.
• I mustn’t eat chocolate. It’s bad for me.
• You mustn’t phone me at work. We aren’t allowed personal calls.
• They mustn’t see us talking or they’ll suspect something.

Gunakan ‘don’t have to‘ (atau ‘haven’t got to’ dalam British English) untuk bentuk negatif dari have to.

• We don’t have to get there on time. The boss is away today.
• I don’t have to listen to this. I’m leaving.
• You don’t have to come if you don’t want to.
• He doesn’t have to sign anything if he doesn’t want to at this stage.
• I haven’t got to go. Only if I want to