I've drunk two cups of tea this morning. vs I drank two cups of tea this morning.

QED.

MrP

Mr P, in what context would a native ESL teacher think or say “There isn’t anything about the present perfect that I can teach you, dear ESLer”?

In what context would a non-native ESL student say to an ESL teacher: 'Ain’t nothing ‘bout “if I get/have chance…” that you can teach me, gal’?