I've done my homework at home.
We use the verb doesn't in present simple only .
He/she/it doesn't.... .
i don't thibk u got ie vladimir....the question is wherther the present perfect tense shud be used or not not the simple present tense itself...
- if we say i've done (....)= im still doing it till now..."was doing it n still doing it till the present moment".
-but if we say i did my (....)= im no longer doing it ----> a complete action in the past.
It works but only in certain contexts. Not a very important or interesting point
It only works in certain contexts and this is one of them. Like if it were another example,' We come from America' that would work also.