Question

Do as directed:
(i) One could eat a little more.
(Identify the modal auxiliary and state its function).

Hint:

Modal auxiliary verbs like "could" are used to express possibility, ability, permission, or make suggestions.

Answer 1

The modal auxiliary in the sentence is could. {Function of "could":} 
"Could" is a modal auxiliary verb used to express possibility, ability in the past, or a polite suggestion. In this case, it is used to express a polite suggestion or possibility. The modal auxiliary is "could," and its function is to express a polite suggestion.

Final Answer: 
The modal auxiliary is could, and its function is to express a polite suggestion.