Краткое пояснение: Чтобы избежать повторения, можно заменить второе упоминание существительного местоимением.
Jacky's dad works in a big office. An office has
a big window and you can see a lovely garden.
The garden has lots of trees and flowers.
Jacky's dad works in a big office. An office has a big window and you can see a lovely garden.
It has lots of trees and flowers.