I am writing to ask you about the proper usage of the verb drink. More to the point, I'm wondering about the usage of drank versus drunk. It's one of those issues that no one I've talked to agrees upon, and I personally think drank is past tense, while drunk is (?) conditional. I drank a lot last night; I have drunk many beers today.
"Drink" is what grammarians call a "strong" verb that changes tense with an internal change; a "weak" verb just adds "ed" to the original verb. Strong verbs include "think/thought," "run/ran," "teach/taught," and "stink/stank." Weak verbs include "love/loved," "smile/smiled," and "ask/asked."
My dictionary says "drunk" is an archaic past tense of "drink." Several hundred years ago, we might have said "I drunk a lot last night." But now we'd say "I drank a lot last night," as you suggest.
"Drunk" is also a past participle of "drink," so it would be used as you suggest in your second example. And as a participle it is also a "verbal adjective" that can modify nouns and pronouns or even act as a noun itself:
He is a convicted drunk driver.
He is a lifelong drunk.