Tell your classmates :
1. what a hobby is ;
2. what hobbies you know ;
3. what things people usually collect ;
4. what a thematic collection is ;
5. what your favourite hobby is ;

A hobby is an interest of each person as an individuality. Each person has a special character, which shows that you are special. Hobby helps you to be more special, to be an individuality.
Here are some basic hobbies that the most of people do. For example, singing, dancing, swimming or chess.
Some people like collecting things. People usually collect rocks, shells, statues of horses, fairies, antique things.
Thematic collection is a collection of thing, collected with a special theme. For example, fairytale collection  or candy wrappers collection.
My favorite hobby is..... i can't write it because your favorite hobby is according to you.
Если что-то не понятно спрашивай. Допиши последний пункт сам.