Проверьте, пожалуйста, правильно ли написаны предложения. Если есть оплошности, скажите где:I

Проверьте, пожалуйста, верно ли написаны предложения. Если есть оплошности, скажите где:
I did not go this summer on the sea. But I spent many of times with my grandmother. I helped her in the kitchen garden and in the house. I often walked with my young brother. I engaged the chemistry, read the book, watched TV in the free time. At first was rainy weather, then it was sunny. However I liked this summer.