— Yes, I am.

—          is a doctor.

A: Tom! Look at that boy. Who's he?

B: He's my friend. He's a primary student.

A: What's his name?

B: His name is Mike.

A: And who's that woman? Is she his mother?

B: Yes, she is.

A: Is she a nurse?

B: No, she isn't.

A: What does she do?

B: She's a doctor.

A: Is the man his father?

B: Yes, he is. He is a vet.

A: Welcome to the zoo, my friends.

B: What are the people doing over there?

A: Oh, they are planting trees in the zoo.

B: Wow, so many monkeys and birds.

C: Look at that man. What does he do?

A: He's a vet. He's helping the animals.

B: He's a good vet, I think.

A: Look, this is my mother. She's an ice-cream woman.

B: Great! We like ice-cream. We are thirsty now.