Read and listen to the dialogue. Then click 'Hide / Show "You"'. Complete the conversation and listen. Then swap roles.
Amy: Where do you think Jon is? He's really late.
You: He might be at home.
Amy: No, he can't be at home. He rang me from the bus stop.
You: Well, the bus must be late.
Amy: Yes, and there might be lots of traffic. Let's call him.
You: He isn't answering. He might not have his phone.
Amy: He must have his phone. I've already called him.
You: Listen! Your phone is ringing! It might be Jon.