Which statement is not correct with reference to modal verbs?
1
Modal Verbs: They express possibility, necessity, permission, ability, etc.
2
Modal Verbs: They are always followed by the base form of the main verb (without 'to').
3
Modal Verbs: They change their form according to the person and number of the subject (e.g., 'I can', 'he cans').
4
Modal Verbs: Examples include 'can', 'must', 'should', 'would'.