Unless I misunderstand your question, it's just a matter of politeness.
彼は食べて、飲む。 He eats and drinks. 彼は食べて、飲みます。 He eats and drinks (polite).
Other endings work the same way:
彼は食べて、飲みたい。 He wants to eat and drink.
More information about formatting options
Unless I misunderstand your
Unless I misunderstand your question, it's just a matter of politeness.
彼は食べて、飲む。 He eats and drinks.
彼は食べて、飲みます。 He eats and drinks (polite).
Other endings work the same way:
彼は食べて、飲みたい。 He wants to eat and drink.