1Vietnamese students have less vacations than American students.

⇒Vietnamese students have fewer vacations than American students.

2. What’s your America’s penpal’s name?

⇒ What’s your American penpal’s name?

3. Doctor Lai looked at Minh and told him don’t worry.

⇒ Doctor Lai looked at Minh and told him not to worry.

4. How often is it from your house to your school?

⇒How far is it from your house to your school?

5. My younger sister feels sick. She ate too many ice- cream yesterday.

⇒My younger sister feels sick. She ate too much ice- cream yesterday.

6. What is your day of birth?- It’s on May 20th.

⇒What is your date of birth?- It’s on May 20th.

7. Would you like to have a dinner with me tonight?

⇒Would you like to have dinner with me tonight?

8.How many are the English books? – I think they are two hundred thousand dongs.

⇒How much are the English books? – I think they are two hundred thousand dongs.

9.The boys in our class like Ronaldo very much because he plays soccer very good.

⇒The boys in our class like Ronaldo very much because he plays soccer very well

10. How are you today? – Not badly, Thank you

⇒How are you today? – Not bad, Thank you