These days are the last ones to finally reachIt is nearing the end of the winter holidays, and because of that we have been lazy on some subjects which ones we have already "complete"d", or rushed through others trying to complete the mandatory number of grades for the semester on others.

"These days are the last ones to finally reach the winter holidays" is a strange sentence that took me a while to understand. By "last ones to finally reach", do you mean these days are the FINAL days of the holidays? In this case, I would say something like, "it is nearing the end of..."



The "ones" in "subjects which ones we have" left me kind of confused. "Which" is already associated with "subjects", so adding "ones" after it sounds strange.

However, you might see "ones" used after "which" in a question like, "Which ones are you going to choose?"
Or in a statement like, "I'll take whichever ones happen to be there." (in a statement like this, it is "whichever ones", not "which ones")

We are on wIt is Wednesday, but my mind is really confused because sometimes Iit feels like Iit is mMonday, and a short time after Ilittle later it will feel like Iit is fFriday.

A more natural way of saying "a short time after" could be "a little later".

I don´'t know why, but this week has been feelingfelt weird.

These days are the last ones to finally reachbefore the winter holidays, and because of that, we have been lazy on some subjects which ones w. We have to "complete," or rushed trying to complete, the mandatory number of grades for the semester on others.

We are on wIt is Wednesday, but my mind is really confused because sometimes I feel like Iit is mMonday, and a short time after, I feel like Iit is fFriday.