Could you please help me correct the letter?
Dear Jack,
It's been a while since we've contacted each other. How is it going these days? I know that you've grown taller and taller. I have also changed a lot.
First of all, in the past it was difficult for me to learn English and I couldn’t understand what my teacher said in class. But now, I've found some good ways to lean English. For example, I take notes by writing down key words. What's more, I used to get up late, but now l get earlier than l used to save more time and study. And I became more mature, so now I know everything my parents do is for me. We have more conversations than before. Last but not least, I used to be so lazy that I seldom went out, but I realized the importance of doing sports. So I've started to take a walk after dinner.
I have changed a lot because I want to do something great for our country. So I need to improve myself to face the challenges confidently.
Sincerely,
{insert your name}