out to lunch：
You must have been out to lunch when you wrote that weird report.
① Would you like to...
?、?Do you wanna (want to.)..
① Would you like to have a drink tonight?
② Do you wanna go out for lunch?
③ Let's go out this weekend.
① I'm buying. / My treat. /It's on me.
② You're my guest.
③ Let's get a drink. I'm buying.
④ Let's go to a bar. It's on me.
⑤ No, I'll pay the tab. You're my guest.
① I'd like to ask you to attend the open ceremonies?['s?r?'mon?z]? next week.
② May we have the honor of your presence at dinner on Friday?
③ It would be my pleasure if you would join us for dinner tonight.
① That would be nice.
② Certainly, I'd love to.
③ Sure, that would be great!?
④Thank you. I'm afraid I have another engagement.
⑤ Thanks for asking, but I'm afraid I can't.
① Invite a friend out for a drink (informal).
② Invite an important person to have lunch with you (formal).