正式的場合可以用Nice to meet u./I've long heard of your name.久仰大名/It's a great pleasure to have you here with us.很高興能請到妳/I am pleased to meet u.我很高興見到妳/I'm delighted to make your acquaintance.我很高興與妳結識.等等
認識很久不見也有很多.long time no see.（最常用的）經常見面的朋友可用 what's up,man?(朋友間的） 正式點可用Small world,isn't it?我們又見面了.