Today

Hi everybody. Today I have a nice day. I meet my grandson and we stay along together. Before dinner I have a session in italky to teach italian. In the free time I study English but It's very difficult because I haven't many hours for it.

Hi, everybody. Today I had a nice day. I met my grandson and we spent a long time together. Before dinner I had a session in italki to teach Italian. In my free time I studied English but it was very difficult because I did not have much time. 

Hi there! I thought I would give you a bit of advice to help you on your way to learning English!

1) So the past tense of "have" is "had". e.g. I have some grapes, I will eat them... 

...as opposed to: I had some grapes. Now they are all gone.

So, today I had a nice day. :)

2) This is not 100% clear. I think you mean you and your grandson spend lots of time together.

3) The past tense of "is" is "was." e.g. Present: I am at home. Past: I was at home, but now I am outside.

When you say "it's," you are shortening "it is" into "it's." Instead, you need to say "it was" when talking about the past. You cannot shorten "it was" into "it's."

4) Present: I do not have much time to study English today. 

Past: I did not have much time to study English today. 

Today

Hi everybody. Today I have had a nice day. I meet my grandson and we stay along spent time together. Before dinner I have had a session in italky to teach italian. In the my free time I study English but It's very difficult because I haven't don't have many hours for it.