I don't know the actual grammatical corrections, but I think I have not (haven't) is usually followed by a verb or action. I do not have is usually followed by a noun or thing. example. I have not said it, I have not done it, I have not written that I do not have this, I do not have chocolate, I do not have shoes

Diary of my life in Canada　June 12

It's been a long time to write a diary. since I wrote in my diary.
Nowadays, I don't have much time...I have many lots of homework and somethings to do.

It has already been passed 3 month since I came to Canada.
I can't imaginge!!!!!!

Anyway, I'm getting lazy, and fat because I often eat out these days.
I have to control my appetite ...
I ate oily foods in this weekends on the weekend, so I'm will make sure to eat many more vegetables from tomorrow!

In this On the weekends, I went to the sauna after eating Korean food.
I was drunk because of I drank too much alcohol.
I'll make sure not to I don't drink too much next time!

I'm thinking of about changing my class.
I only have 3 month left to study English in ESL.
I'm very serious about my study abroad.
So I'll ask my teacher about that tomorrow.

I'm going to go to the library tomorrow to prepare for my presentation.
We only have just 4 days left in this week until our final test is on Thursday.
Cheer up !!! Hung Hang in there!!!

What do I do today?

Well, if I should write something for practice english, I want to write about some that I learned today... really That isn't too good, but why not? Hahah and sorry for the mistakes. Today I got up early because I started the class of contemporaneous dance in the central Historic from Quito. My friend and I walked until the institute. The class was extrange :/ First, we didn't know anybody, and second, I never dance :/ I'm a little bad with that.... I believe that I have 2 legt legs ._. Hahah but well, I learned to dance today! Ok, It's an exageration, only I'll say that dancing is more interesting and hard, very hard :/ or not?
It could be because was us first day ._. Good, the people always say "the practice make to the master"

What did I do today?

Well, if I should write something for to practice English, I want to write about something that I learned today... it really That isn't too good, but why not write about it? Hahah and sorry for the mistakes. Today I got up early because I started the had a class of contemporaneous contemporary dance in the central Historic from Quito (not sure whether you are trying to say where you went or where the dance is from, (from the central historic era of Quito), or (in the historic centre of Quito))  . My friend and I walked until to the institute. The class was extrange strange :/ First, we didn't know anybody, and second, I never dance :/ I'm a little bad with that at it.... I believe that I have 2 legt left legs._. Hahah but well, I learned to dance today! Ok, It's an exageration, only I'll say that dancing is more interesting and hard, very hard :/ or not? 
It could be because it was our first day ._. Good, the people always say "the practice makes to the master"

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keep up the good work though :)

I have only really heard the term "for free" being used in regards to money and not decision making. You would usually say "you are free to make the decision" or something similar in the context you are referring to.