I should had my english class homework. It was write few sentences about 'introdution my self'. = I should have done/made/written my English homework better.  written in few sentences and it was about "self-introduction".

That class was so easy for me. So I didn't do that homwork. = homework

And that day I remember it, and that time, I was in car. = I remembered that day, I was in the car that time.

So I wrote is very fast. = it

Then it was so bad composition! So I was very sad. Because that time, I was can show my skill! = I could

But my work was not too proud thing. It was so bad. = My work was something I shouldn't be proud of. It was not that good.
I think many people have like this experience. So they know wat to do. But it's not to easy. So best way is ' when you get homework, do it right now!' This is the best way. = have had this experience...what...But is wasn't easy.