9. Must and have to
The verb must means that something needs to be done or needs to happen.
Must is also a modal verb. It has only the present tense. In other tenses, the expression have to can be used.
EXAMPLES:
You must change into dry clothes.
Mikko had to do that too.
Have to also works in the present tense.
EXAMPLE:
I have to go now.
I have to go now.