Ответ:
- It is an apple.
- It is — my apple.
- It is an old doll.
- It is an alligator.
- It is a little alligator.
- He is an economist.
- She is a teacher.
- That’s a good idea.
- It is an English song.
- It is a Russian song.
- These are — oranges.
- This is an orange.
Правило: артикль относится к существительному, но перед ним учитывается первый звук всего определения: an old doll, a little alligator.
