Помогите пожалуйста!!!!!! Нужно сочинение с must и have to

Hello! My name is *имя*. I am the pupil and I must to study well. 
So, I must to take care about my younger sister. She is three years old. Sometimes my mom isn't at home, so I must to take cear about Lilia(this is her name). 
When the weather is cold, I  must to wear I warm clothes. For example, my warm winter jacket, woolen cap and warm scrarf.
I have to swim after school. Swimming is my favorite hobby.