I / Am / your friends / ?
Am I your friend?
Am I sad? (x)
No, I am not.
Are / brothers / you / ? (x)
Are you brothers?
Are they the same colors? (x)
No, they aren't.
Is he your father?
Yes, he is.
they / six years old / Are / ?
Are they six years old?
small / Is / your house / ?
Is your house small?
Is it a dog?
Yes, it is.
Is / your mother / she / ?
Is she your mother?
Is she a doctor? (x)
No, she isn't.