Hallo Leute, these are my thoughts
esse - this is used for first person "Ich".
Remember "Ich" takes this form e.g ich lerne, ich esse(eat), ich habe, ich fahre... Etc
essen - used for first person plural "Wir" and second person formal "Sie" or 'you' and third person plural 'they' that is "sie".
So in short verbs for first person plural, we, "wir" and second person formal "Sie" and third person plural "sie" take this form...
Wir und Sie/sie > essen, haben, tanzen, spielen, wollen..... Etc
esst - used for "ihr" for the plural form of second person. E.g ihr esst
I used to think that it was strange that 'sie' is used for both 'she' and 'they', but in Old English the forms are 'heo' (survived in dialects as hoo) and 'hie', which was eventually replaced by the Norse 'þeir' as 'they' (cognate with archaic plural article 'tho' like German 'die'), but the original object case 'hem' survives as 'em (which doesn't derive from them).
So with 'heo' and 'hie' in Old English, 'sie' and 'sie' isn't that strange.
"Trinkt" is the 3rd person singular conjugation, so "sie trinkt" can only mean "she drinks/is drinking."
"You drink" would require the 2nd person conjugation. So, if you wanted to use "Sie" (note the capital S - will always be capitalized for the formal "You"), you would have to use the formal 2nd person singular conjugation, which is "trinken". i.e. "Sie trinken"
Since the present tense inGerman can also be used for the present progressive, why can't you say the sentence has other variations of meaning, like We eat and they drink, or We are eating and they drink (that was my answer), or We eat and they are drinking? Do both verbs need to be understood in the same tense?
Do both verbs need to be understood in the same tense?
That would be a natural answer, yes.
Why would one mix the tenses in an English sentence? The two sentences are connected by "and"; generally, you would be talking either about two repeated actions or two current actions.
Lowercase sie can never mean "you" -- the formal "you" is always capitalised, Sie. (At the beginning of a sentence, you can't tell the difference, of course.)
"she" verb forms end in -t, e.g. sie ist, sie trinkt, sie hat
"they" and "you" verb forms end in -en, e.g. sie trinken, Sie trinken; sie haben, Sie haben. Exception: sie/Sie sind.