Have to or must?

English as a Second Language English Vocabulary, Grammar and Idioms
1

:!: Use “must” for strong obligations at the moment of speaking.
Use “have to” for daily responsibilities.
Examples:
I have to catch a train to work every morning.
I must get going.It’s late!
Happy New Year! :smiley:

2

.
This is not a good ‘rule’, arlindomarco. HERE is a better explanation.
.

3

Hi arlindomarco,

Another difference between the two constructions is that ‘must’ is very often external compulsion and ‘have to’ is internal compulsion. In other words ‘must’ is often another person telling you what to do and ‘have to’ is often you telling yourself what to do. For example:

I must be early for work tomorrow because my boss has told me to be and so I have to get up early.

Alan