Raising money for charity

Today's lesson: Modals
Students will read the"use of English" on page 125.
The modal verbs are:
can
can't
must
mustn't
have to
don't have to
We use can/can't to express possibility and for permission.
Use must and have to for rules.
Use mustn't for negative orders.
Use don't have to to say that something is not necessary.