I ___ 15 years old. (+ affirmative)
am
She ___ my teacher (+ affirmative)
is
He ___ _____ sick (- negative)
is not / ins't
My brother ____ late for school (+ affirmative)
is
I _____ in class today (- negative)
am not
You ___ my friends. (+ affirmative)
are
they _______ my classmates. (- negative)
are not / aren't
___ you at work? (? question)
are
___ your friend at the library (? question)
Is
My dog __ happy (+ affirmative)
is
