1. This is Nick's dog and these are his birds. 2. This is Meg's schoolbag and this is her uniform. 3. This is their ball. 4. This is her parents and this is Ted's kite. 5. Jenny's toys and his teddy bear. 6. These are Bill's pens and her toys box. 7. These are my dad's car and his bicycle. 8. These are my mum's cats and their cage. 9. These are their aunt's parrots and their cage.

Решение:

• 1. This is Nick's dog and these are his birds. (Собака одна, поэтому используем 'this is').
• 2. This is Meg's schoolbag and this is her uniform. (Школьная сумка одна, форма одна, поэтому используем 'this is' для обоих).
• 3. This is their ball. (Мяч один, поэтому используем 'this is').
• 4. This is her parents and this is Ted's kite. (Родители – множественное число, поэтому «these are». Воздушный змей один, поэтому «this is»).
• 5. Jenny's toys and this is her teddy bear. (Игрушки Дженни – множественное число, поэтому «these are». Плюшевый мишка один, поэтому «this is»).
• 6. These are Bill's pens and her toys box. (Ручки Билла – множественное число, поэтому «these are». Коробка с игрушками одна, поэтому «this is»).
• 7. These are my dad's car and his bicycle. (Машина папы – одна, поэтому «this is». Велосипед – один, поэтому «this is»).
• 8. These are my mum's cats and their cage. (Кошки мамы – множественное число, поэтому «these are». Клетка одна, поэтому «this is»).
• 9. These are their aunt's parrots and their cage. (Попугаи тети – множественное число, поэтому «these are». Клетка одна, поэтому «this is»).

Финальный ответ:

• 1. This is Nick's dog and these are his birds.
• 2. This is Meg's schoolbag and this is her uniform.
• 3. This is their ball.
• 4. These are her parents and this is Ted's kite.
• 5. These are Jenny's toys and this is her teddy bear.
• 6. These are Bill's pens and this is her toys box.
• 7. This is my dad's car and this is his bicycle.
• 8. These are my mum's cats and this is their cage.
• 9. These are their aunt's parrots and this is their cage.