Obligation and permission 101

When we want to talk about what we are obliged to do (or what we must do), we can use the verbs 'must' or 'have to'.

To talk about what we are permitted to do (or allowed to do), we can use the verbs 'let', 'can' or 'be allowed to'.

Must and Have to:

Must and Have to are both used to talk about rules or obligations.

1. Must and have to are both followed by the base form of the main verb:

She must give money to her parents every month.
They have to get a visa before they go on holiday to the USA.