Adam: Have you decided where you are going on vacation this year?
Ian: Not yet.
Ian: We are thinking about the Alps but Mary is not sure if she dares to go by plane.
Adam: And you can not go by bus?
Ian: We can, but it would be a very long and uncomfortable journey.
Ian: And the tickets are very expensive. 
Adam: Oh, I see...
Adam and Mary haven't decided about their holidays yet. Bus tickets to the Alps are very expensive and the travelling time is long.