Here are the corrections needed for each sentence:

1. **We can keep healthy by eat well and exercising regularly.**
Correction: "eat" should be "eating".
Corrected: "We can keep healthy by eating well and exercising regularly."

2. **It's easy to see that stamp collecting and coin collecting is parallel hobbies.**
Correction: "is" should be "are".
Corrected: "It's easy to see that stamp collecting and coin collecting are parallel hobbies."

3. **We need calories to do things every day: walking, ride a bike and even sleeping!**
Correction: "ride" should be "riding".
Corrected: "We need calories to do things every day: walking, riding a bike and even sleeping!"

4. **Nancy loves cartoons, but she says she doesn't continue this hobby in the future.**
Correction: "continue" should be "continuing".
Corrected: "Nancy loves cartoons, but she says she doesn't continue this hobby in the future."

5. **I didn't donate food but sing and danced with the elderly in the nursing home.**
Correction: "sing" should be "sang".
Corrected: "I didn't donate food but sang and danced with the elderly in the nursing home."

6. **Do you think having a health lifestyle is essential for all people?**
Correction: "health" should be "healthy".
Corrected: "Do you think having a healthy lifestyle is essential for all people?"

7. **Don't too eat much ice cream because it can make you fat!**
Correction: "too" should be "eat".
Corrected: "Don't eat too much ice cream because it can make you fat!"

8. **Last year I encourage her to work hard and to try for the examination.**
Correction: "encourage" should be "encouraged".
Corrected: "Last year I encouraged her to work hard and to try for the examination."

9. **My mum wants to keep fit, or she practises gym three times a week.**
Correction: "practises gym" should be "practises at the gym" or "goes to the gym".
Corrected: "My mum wants to keep fit, or she practises at the gym three times a week."

10. **I asked some classmates about their hobbies and I get some interesting results.**
Correction: "get" should be "got".
Corrected: "I asked some classmates about their hobbies and I got some interesting results."

You can revise the sentences based on these suggested corrections.