Liz: Erica thanks for inviting me to your birthday party. I was really looking forward to next Saturday night
Erica: i've been planning this party for ages! You're coming, aren't you?
: well erica i'm calling you up to explain. Unfortunately i'm not going to be able to make it
: no way! I refuse to accept that. I insist on your coming
: i'm sorry , i really am. You see it's my parent's wedding anniversary, and they're having the whole family over for dinner. They expect me to be there, and i can't tel them down
: so, sneak out as soon as the dinner's over
: i can't just walk out like that
: of course you can