1accounts-pressent Indefinite
Britain's-притяж.падеж
2contains-presemt Indefinite
Mysteries-множ.число сущ(mystery)
3falls,lies-present indefinite
4lies,goes-present indefinite
hills-множ.число сущ.
See a well-known musician, you learn his book
1) It isn't a dog. It's a snail.
2) It isn't cat. It's a horse.
3) It isn't spider. It's a bird.
4) It isn't bird. It's a cat.
5) It isn't snail. It's a spider.