Проверте пожалуйста на грамматику и времена.Готовлюсь к ОГЭ.Dear Duncan,I was glad

Проверте пожалуйста на грамматику и времена.Приготовляюсь к ОГЭ.
Dear Duncan,
I was glad to get your letter!I'm sorry I haven't answered earlier but I was really busy with my school.
I don't like winter so I usually spent weekends at home with my family.I think that the best спорт for a teenager is dancing,especially for girls,because the dance is the modern art.For boys it can be football and basketball.I think that I might like to try playing on piano or gitar,because I like music very much!
I have to go now because my mum asked me to help her with the washing up.
Hope to hear from you soon.
With the best wishes,
Elina