Отрицательные формы:
is → isn't
are → aren't
am → am not.
2) My sister is blonde. → My sister isn't blonde.
3) His cat is fat. → His cat isn't fat.
4) Annd and Tom are ten. → Anna and Tom aren't ten.
5) My mum and dad are busy. → My mum and dad aren't busy
6) You and I are famous. → You and I aren't famous.
7) My dad is a doctor. → My dad isn't a doctor.
8) We are hungry. → We aren't hungry.
9) You are clever. → You aren't clever.