Thank you for your explanations. Here are some more sentences I'd like you to check.

1) I like very much sports like running, swimming and skiing.
I love dancing and I do it four times a week.
2) I like staying with my friends.
I like going to shopping centres and buy clothes and shoes.
3) I usually do my maths tests well.
I was born in London's hospital on 6 April 1989. I'm one meter sixty tall and I weigh 40 Kilo(S):
4) I have got one (or a?) dpg and thre fowls.
I don't like visiting museums OR (not and) meeting people.
5) I don't like history or geography.
I am looking forward to meeting you. In the meantime I send you all my deepest regards. Bye (Can you finish off an informal letter this way??)

1) I like sports such as running, swimming and skiing very much.

I love dancing, and I do it four times a week.

2) I like staying with my friends.
I like going to shopping centres and buying clothes and shoes.

3) I usually do my maths tests well.
I was born in London's hospital on 6 April 1989. I'm one meter sixty tall and I weigh 40 Kilos.
I don't understand this: "one meter sixty tall" -- unless you mean 1.6 meters tall.

4) I have a dog and three parakeets.
I don't like visiting museums or meeting people.

5) I don't like history or geography.
I am looking forward to meeting you. In the meantime, I send you all my deepest regards. Bye (Can you finish off an informal letter this way??)<~~Yes