Here are the sentences with the mistakes underlined and the corrected versions written below:

1. Our teacher **often is** late.
**Corrected Sentence:** Our teacher is often late.

2. We **eat never** fast food.
**Corrected Sentence:** We never eat fast food.

3. He usually **doesn't go** to bed late.
**Corrected Sentence:** He usually goes to bed late.

4. They **alwways are** very tired after the match.
**Corrected Sentence:** They are always very tired after the match.

5. We **have always** breakfast at home.
**Corrected Sentence:** We always have breakfast at home.

7. Are you tired **sometime** at the end of the class?
**Corrected Sentence:** Are you sometimes tired at the end of the class?

8. **Is always** your teacher in class on time?
**Corrected Sentence:** Is your teacher always in class on time?

9. What time **usually you get** up at the weekend?
**Corrected Sentence:** What time do you usually get up at the weekend?

10. We **often don't admit** our mistakes.
**Corrected Sentence:** We don't often admit our mistakes.