EXAMPLE 1: How do you do?
Meaning:
used to greet a stranger for the first time.
Example:
Person A: How do you do?
Person B: How do you do? not I am a student.
The common mistake: some people confuse between “how do you do?” and “what do you do?”.
EXAMPLE 2: Age
Question: How old are you?
Answer: I am twenty five years old. or I have got twenty – five years old.
The common mistake: I have twenty – five years old.
EXAMPLE 3:
I go to school on foot / feet.
The common mistake: I go to school by foot.