I. Find a mistake in the four underlined parts of each sentence. 1. What time does Mai has English class? 2. Do you often go at school library when you have free time? 3. She cleans the floor every morning. She cleans it now. 4. When time do you usually get up every day? 5. Does your mother and Mrs. Lanh work here? Yes, they do. 6. How many child does she have? Two sons and two daughters. 7. John are cleaning the room at the moment 8. I swim usually at the weekend 9. I and Lan rides a bike to school everyday 10. My mom don’t usually go to work on Saturday 11. My father works at the moment. 12. I am often playing football on Saturdays. 13. She is wanting to buy a new computer. 14. My children doesn’t like reading. 15. We have breakfast now. 16. The girls are skip on the playground. 17. Ann gets up at 6 o’clock and is having breakfast every day. 18. I’m sorry I don’t have time. I cook dinner. 19. I can see that there is a vase behind of the light. 20. We don’t stay up late in night.