Heidi invited us to have a dinner, why?
第一个句子: I'll treat!==My treat! 我请客!
I want to invite you to dinner. I'll treat!
第二个句子: It's a deal! 一言为定!
第三个句子: Let's go fifty-fifty. AA制!
Reference:
a. Are you free tomorrow? I want to treat you to dinner.
b. Is it a deal?
a. It's a deal.
b. So see you at the old school gate.
a. See you and be there or be square!
b. See you!
