Read the paragraph from a personal narrative.

1. I remember when Ben first had the idea for a community garden. 2. We were walking home from school past an old abandoned dirt lot. 3. Ben stood and stared through the fence for awhile lost in thought. 4. I thought he was acting strangely. 5. I was walking by the dirt lot again, and there was Ben digging up the dirt with a shovel.

What is needed at the beginning of sentence 5?