It's OK to make plans with friends at the last minute. It's more
            polite, however, to make them ahead of time.
            临时作出计划约请朋友是可以的,但是提前安排好计划则更为礼貌.

            1.A: How about going to hear a country-and-western singer tonight?
            B: I'd enjoyed that.
            A: I' pick you up around 8:00.
            B: OK. I'll see you then.

            2.A: Do you feel like going to see Paul and Claire tonight?
            B: I'd like that very much.
            A: How does 7:30 sound?
            B: Fine. See you late.

            3.A: Would you like to go to a party tonight?
            B: That sounds like a good idea?
            A: Would 7:00 be OK?
            B: That's fine. I'm looking forward to it.

            4.A: Why don't you have dinner with me tonight?
            B: I'd love to.
            A: Let's say about 6:00?
            B: That's OK with me