The short forms of negatives are made with n’t, except with

AM NOT
ISN’T
AREN’T
I ______ a boy.
Great!
‘m not
VERB TO BE

AM NOT
ISN’T
AREN’T
She ______ old.
Great!
isn’t
VERB TO BE

AM NOT
ISN’T
AREN’T
My brother _____ an old man .
Great!
isn’t
VERB TO BE

AM NOT
ISN’T
AREN’T
These birds ______ big.
Great!
aren’t
VERB TO BE

AM NOT
ISN’T
AREN’T
My son and I _______ bored.
Great!
aren’t
VERB TO BE

AM NOT
ISN’T
AREN’T
The balloon _______ red.
Great!
isn’t
VERB TO BE

AM NOT
ISN’T
AREN’T
The dog ______ big and ugly.
Great!
isn’t
VERB TO BE

AM NOT
ISN’T
AREN’T
You _______ teachers.
Great!
aren’t
VERB TO BE

AM NOT
ISN’T
AREN’T
Rose _______ Portuguese.
Great!
isn’t
VERB TO BE