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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.