history: I was supposed to meet my Aunt to give her keys to babysit this weekend, but she isn't answering her phone. I'm worried that if my Aunt doesn't answer her phone_comma_ I won't be able to give her the keys so she can babysit for me this weekend.
current: Oh no! Are you going away this weekend?
next: Yes, I am going on a business trip by my son has an important tennis match this weekend. I don't know what I'll do if my Aunt doesn't answer soon.