10. Although there are many interesting films on TV, I like watching them at the cinema.

11. You should not eats lots of sweets.

12.  Mike doesn't plays chess as well as Barbara.

13. We might visit Japan in the future.

14. If we plant more trees, the air will be fresher.

15. if we don't protect the environment, we will destroy ourselves.

                                                                                            @Quin

10. There are many interesting films on TV but I like watching them at the cinema.

→ Although there are many interesting films on TV, I like watching them at the cinema.

 11. I advise you not to eat lots of sweets

-> You should not eats lots of sweets.

12. Barbara plays chess better than Mike.

→ Mike doesn't plays chess as well as Barbara.

13. We will probably visit Japan in the future.

→  We might visit Japan in the future.

14. We will plant more trees.

->  If we plant more trees, the air will be fresher.

15. Unless we protect the environment, we will destroy ourselves.

→ if we don't protect the environment, we will destroy ourselves.