question on past simple present perfect

[snoopya1984]

Do we say "I studied a lot this week"or only" I have studied a lot this week" is acceptable?

 

[bhaisahab]

Do we say "I studied a lot this week"or only" I have studied a lot this week" is acceptable?

Both are acceptable.

 

[ScarlettBegoni]

I'm not sure, but isn't it: "I studied a lot this week."->my studying is over, I finished it and now I can chill out.
"I have studied a lot this week."-> I still have some books on the table, maybe my exams are tomorrow,... or maybe I'm after a really important exam, and I can be satisfied and say: I have studied a lot...

Am I wrong?

 

[Raymott]

I'm not sure, but isn't it: "I studied a lot this week."->my studying is over, I finished it and now I can chill out.
"I have studied a lot this week."-> I still have some books on the table, maybe my exams are tomorrow,... or maybe I'm after a really important exam, and I can be satisfied and say: I have studied a lot...

Am I wrong?

No, you're not wrong. The simple past "I studied ..." implies that the study week is over. The present perfect does not imply this (although it could be over).
If it's Sunday, and your normal study week is Monday to Saturday, you could use either sentence, on the technicality that, although the study week is over, the week is not yet over. (Note I'm assuming that a week is Monday to Sunday.)

 

[ScarlettBegoni]

Somebody has eaten my apple. (I have no apple now.)
Somebody ate my apple. (I have no apple.)
Somebody has been eating my apple.(I have an apple, but I see some marks of biting on it.)
Where is the difference between the first and second? My english teacher gave me(or has given me? ) these two examples for each tense. And is my explanation of the third one correct?

 

[Raymott]

Somebody has eaten my apple. (I have no apple now.)
Somebody ate my apple. (I have no apple.)
Somebody has been eating my apple.(I have an apple, but I see some marks of biting on it.)
Where is the difference between the first and second? My english teacher gave me(or has given me? ) these two examples for each tense. And is my explanation of the third one correct?

Yes, 3 is OK.
You seem to understand the concept. What's your opinion on the difference between 1 and 2.

 

[ScarlettBegoni]

I think the first, Somebody has eaten my apple.: My eaten apple was on a table and now I want it, it wasn't such a long time ago... So I say: Somebody has eaten my apple, oh damn!

And the second one: My mother is asking whether I had eaten my collation and I say: Sandwich yes, but somebody ate my apple!

Am I wrong?

 

[Raymott]

I think the first, Somebody has eaten my apple.: My eaten apple was on a table and now I want it, it wasn't such a long time ago... So I say: Somebody has eaten my apple, oh damn!

And the second one: My mother is asking whether I had eaten my collation and I say: Sandwich yes, but somebody ate my apple!

Am I wrong?

Again, no, you're not wrong.