A:What's the weather like?
B:I don't know. I just woke up.
A:Why don't you look outside?
B:Okay. It looks like rain.
A:Why do you say that?
B:The sky is gray.
A:Is it raining right now?
B:No.
A:How do you know?
B:The street isn't wet.
A:I have to go shopping today.
B:You'd better take an umbrella.