介绍:
Q: "Are you free next week?"
A1: "I've got a lot to do, sorry. Another time."
A2: "I'll let you know."
A3: "I'll get back to you."
A4: "I have a tight schedule on that day."
A5: "I'm tied up that day."
"Sorry, I have somewhere to be."
"Sorry, I've got to run." / "Sorry, gotta run."
