I must, I have to: It’s an obligation, isn’t it?

In general the difference between Must and Have to is connected to personal opinion. If it is your personal opinion to do something then usually we use MUST + BARE INFINITIVE, and if it isn’t connected to your opinion, for example an external situation, then we usually use HAVE TO + BARE INFINITIVE.

MUST:

1. My hair looks like a bird’s nest I must go to the hairdressers.
2. I must phone my mother because I’ve not spoken to her for a month.

HAVE TO:

1. My nephew has to go to school
2. I had to walk home last night as I missed the last bus.

Sounds easy?! Well, test your knowledge here: Click here