Must and Have to, can be used to express obligations. Simply put: Must expresses a personal obligation while Have to an impersonal obligation or fact.
So, with this in mind:
- I must start writing my Christmas cards.
- I must go on the wagon for a few weeks because I want to drink like a fish during the festive period.
- I must check my bank balance to ensure that my credit card isn’t about to be confiscated.
- I must stockpile bottles of wine and tins of lager because drinking is the only way to cope with Christmas jingles.
- I must stockpile a lot of pain killers.
- I must find a new boyfriend who is keen on the concept of ‘part-time temporary’ dating. All this commitment is getting on my nerves.
- I must think of an unquestionable reason why I’ve decided not to spend Christmas with my family.
- I must remind myself not to go ice skating because this leads to broken bones.
- I must invent a cheap gadget to help my ass defy the law of gravity.
Gosh, I feel exhausted with all these obligations!
Inglés Málaga 
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