Correct the mistakes:
1. I doesn't do my homework..
2. He often help me with my maths.
3. Nina don't like to go to the shop.
4. Ben play the guitar every day.
5. Bess don't like coffee at all.
6. We plays football at school every day.
7. She doesn't watches new films.
8. I tidies my room every week.
9. They brings nice photos to school.

1. The correct sentence is "I don't do my homework." We use "don't" with the pronoun "I" to form the negative sentence in the present simple tense. The verb "do" should also be in its base form without the "s" ending.

2. The correct sentence is "He often helps me with my maths." We add an "s" to the verb "help" when using it with the pronoun "he" in the present simple tense.

3. The correct sentence is "Nina doesn't like to go to the shop." We use "doesn't" with the pronoun "Nina" to form the negative sentence in the present simple tense. The verb "like" should also be in its base form without the "s" ending.

4. The correct sentence is "Ben plays the guitar every day." We add an "s" to the verb "play" when using it with the pronoun "Ben" in the present simple tense.

5. The correct sentence is "Bess doesn't like coffee at all." We use "doesn't" with the pronoun "Bess" to form the negative sentence in the present simple tense. The verb "like" should also be in its base form without the "s" ending.

6. The correct sentence is "We play football at school every day." The verb "play" should be in its base form without the "s" ending when using it with the pronoun "we" in the present simple tense.

7. The correct sentence is "She doesn't watch new films." We use "doesn't" with the pronoun "she" to form the negative sentence in the present simple tense. The verb "watch" should also be in its base form without the "s" ending.

8. The correct sentence is "I tidy my room every week." The verb "tidy" should be in its base form without the "s" ending when using it with the pronoun "I" in the present simple tense.

9. The correct sentence is "They bring nice photos to school." The verb "bring" should be in its base form without the "s" ending when using it with the pronoun "they" in the present simple tense.

I hope this explanation helps you understand the corrections. If you have any more questions, feel free to ask!