There is one mistake in each sentence. Underline and correct the mistake

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VI. There is one mistake in each sentence. Underline and correct the mistake.
1. Nam is my classmates. He watches TV every night.
2. I think collecting stamps are interesting.
3. My dad cooks very good. He loves preparing meals for our family.
4. I enjoy to ride my bike to school.
5. We usually go in a small lake out of the city at weekends.
6. Do you still play football next year?
7. We like doing fishing because it is relaxing.
8. Do you think bird-watching interesting?