Question

He can feed you. (Replace the modal Auxiliary showing compulsion)

Answer 1

The modal auxiliary can be replaced as follows:

He must feed you.

• In English Grammar, modal auxiliary verbs can be described as a type of auxiliary verbs which shows a characteristic of the main verb.
• Common modal auxiliary verbs are may, shall, should, must.
• As the question demands a modal auxiliary verb of compulsion, hence  'must' is the correct verb to be used here.