You're an excellent doctor.
Thank you, you're very polite.
This is my brother John.
Hello, I'm David.
oh dear, we're late again.
It isn't my fault. There isn't a clock in my house.
This isn't very difficult.
Not at all, its easy
She isn't very pretty.
no, but she's kind.
Im sure this is our house.
no it isn't.
I am, I'm.
You are, you're.
It is, it's.
He is, he's.
We are, we're.
Isn't, he isn't late.
Aren't, we aren't polite.

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