Simply a text

A long time ago that  I haven't written anything for a long time on italki, so I have decided to do it right now.
I am studying English at the English school. The course is about to finish, and I have studied many  diferents  different subjects.  , but  As I see it, I am not working too hard because I don't have a lot of confidence on in myself. Today  it  was really hard because of the prepositions. I can also see that we don't use the verbs on in Spanish We don't use them perfectly. Can you believe it?
The other thing that I want to mention is about the opportunity give given to us by Italki. Isn't it amazing?

I have corrected a few of texts on Italki, and I really enjoy doing it.
Even though some of them are a little large!
But I know, when someone starts to write he/it is they will be unable to stop.( which one should I use here?) ( "they will be...." or "he or she will be....")
I am so grateful with (I recommend "for", but "with" is correct ) people who correct my texts, and I hope improving and learning about from my mistakes. I should improve quite a lot if I want to pass my English exam, but I am have decided to get my act together.
Thank you so much!