下列各句均有一处错误,请找出并改正。 1. Do you know English is the main language use by people? 2. How many boat can you see on the river? 3. Can you see some children? 4. It's time for play volleyball. 5. We should understand the world news. 6. Don't playing basketball in the room. 7. The students are doing their homework careful. 8. I hope you can find a good work. _____ _____ _____ _____ _____ _____ _____ _____