As soon as Bob ran down the road, he fell over.

Since the thunder roared, the hobbits hid.

Whilst Bilbo slept in a cave, the goblins attacked

Before the cart came to a wheezing halt, Gandalf strode into the hobbit hole.

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

Owls are nocturnal, so this means they are active at night and they have excellent eyesight.