1. John is more intelligent than his brother.
John's brother....
2. How long has it been since you last wrote to your parents?
When
3.Mr. John is the youngest teacher in our school
No one
1. John is more intelligent than his brother. John's brother is not as intelligent as John is. 2. How long has it been since you last wrote to your parents? When did you last wrote to your parents? 3.Mr. John is the youngest teacher in our school No one in our school is as young as Mr. John is.