Cleaning the Beach

Hannah: Where were you yesterday evening, Arthur?
Arthur: I was outside with my friends. We were at the beach.
Hannah: At the beach? Why?
Arthur: We were there to collect litter. You know, people usually throw litter on the beach.
Hannah: Yes, and that makes our beaches so dirty. Which friends were you with?
Arthur: I was there with Matt and Anna. There was a lot of plastic and fruit litter, and they were very helpful.
Hannah: Do you want to do it again today?
Arthur: No, we do it every weekend. Do you want to join us?
Hannah: Sure. Just call me every time you go there.
Arthur: Welcome to our group, then!