have to / must

[galdina]

Hi everyone
Please can you tell me where to use have to and where must in sentence.
If you can give definicion about have to / must,please.
Thank you

[faryan]

Hi everyone
Please can you tell me where to use have to and where must in sentence.
If you can give definicion about have to / must,please.
Thank you

they sound the same to me, they both convey compulsion and obligation,but the following could be helpful.

have to
3. must, should, be forced, ought, be obliged, be bound, have got to, be compelled Now, you have to go into town.
4. have got to, must That has to be the biggest lie ever told.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002

[5jj]

In BrE, 'must' tends to suggest an obligation imposed by the speaker, 'have to' an obligation imposed by a third party:

Teacher: You must do this homework tonight. (I, the teacher, impose the obligation.)
Mother: You have to do this homework tonight. (Your teacher has imposed the obligation).

With a first person subject, the difference is lesss obvious, as speakers sometimes use 'have to' in place of 'must' out of politeness - they wish to suggest that they are doing something reluctantly;

"I have enjoyed talking to you, but I have to leave now."

[galdina]

thank you for help