Correction of the last week composition

If Henry were my best friend, I would help him and I would tell his wife that he was with me the previous night. I would tell his wife that we were watching T.V. and drinking beer at my place.I would tell his wife that he didn´t do any bad things.

But If Henry weren´t my best friend, I wouldn´t help him and I would tell his wife that he wasn´t with me the previous night. I would tell his wife that Henry has a lover. I would tell his wife only bad things only to have some fun.

But if I didn´t have any kind of friendship with Henry, I would only say that Henry wasn´t with me, but I saw him out of his house smoking.

To improve the mistakes that I had:

First, I will try to write an essay because I usually write the sentences that comes to my head in that moment and that´s the sheet of paper that I give to the teacher. I should do my homework a day before the class, not one hour before of it. I will try to read the homework after I finish it.