[Grammar] studied vs have studied in present situation answering a past action

[Esidarap]

Assume this is the scenario. I need to study for 3 hours every week and I have done it. Today is Sunday and while I am playing cards, mum walks in.


Mum asks "Why are you playing cards and not studying?"


(1) My answer " I am playing cards and not studying because I have studied my designated 3 hours yesterday."

(2) My answer " I am playing cards and not studying because I studied my designated 3 hours yesterday."


Which answer is grammatically correct? And why ?


My personal opinion : Since I have the word "yesterday", logically, it seems like (2)is correct. However, (1) somehow seems correct too but I don't know why (I might be wrong).


Thanks for your help.

 

[TheParser]

***** NOT A TEACHER *****


Hello, Esidarap:

I think that #1 would be acceptable if you just deleted "yesterday":

"I'm relaxing now because I have already studied for the required three hours."

Compare: "I have already read that book." / "I read that book last year."

 

[emsr2d2]

It's a very formal way of speaking to your mum. I would expect a somewhat more relaxed "I'm playing cards cos I've already done my three hours study for this week".

 

[Raymott]

My personal opinion : Since I have the word "yesterday", logically, it seems like (2)is correct.

That's my personal opinion too, without the following doubt.

 

[MikeNewYork]

I am not happy with the "word" "cos". I don't think we should encourage its use.

 

[emsr2d2]

I was trying to convey the casual, colloquial way people speak (whether it's to their parents or not). Unless I'm in a formal situation, I don't say "because". I'm not encouraging its written use except when reporting speech.

 

[Raymott]

I never omit the 'b' even in quick speech. I might say however, not 'cs' but 'bs'.