Bob fell over because he ran down the road.

The thunder roared, so the hobbits hid.

The goblins attacked as Bilbo slept in the cave.

As soon as Gandalf strode into the hobbit hole, the cart came to a wheeling halt.

Jim was interested in the idea, so he rang his friend.

Owls are nocturnal which means they are active at night and have excellent eyesight.