Hello, Mary. Why are you standing here in the cold wind?
I'm waiting for a bus, but the buses are very full at this time of the day.
Where are you going? This isn't your way home. You must take a bus from the other side of the street to go home.
I'm not going home now. I'm going for a walk in the park. I always like to go for a walk before lunch.
Then why aren't you going there on foot? Why are you going by bus? Why not walk to the park from here? It isn't very far.
Oh, no, Bill. It isn't very interesting to walk through the streets, in fact, it's very boring. So I always take bus No. 3.