YOU SAID:
I'm so tired i could probably sleep for 10 hours
INTO JAPANESE
私はとても疲れているので、おそらく10時間眠ることができました
BACK INTO ENGLISH
I was so tired that I could probably sleep for ten hours.
INTO JAPANESE
私はとても疲れていたので、おそらく10時間眠ることができました。
BACK INTO ENGLISH
I was so tired that I could probably sleep for ten hours.
You've done this before, haven't you.