1. Nice to SEE you / Nice to MEET you / How do you do?
Nice to see you 用在认识的人打招呼，Nice to meet you 用在不熟或初次见面的场合。而 How do you do? 多用在比较正式，且与他人初次见面的场合。
2. How are you doing? / How’s it going? / How’s everything? / Howdy!
这几句都是「你好吗？」的意思，万用句，而 Howdy 是 How do you do? 的简化版。
3. How’s your day? / How’s today?
这两句的意思比较偏向「今天过得如何？」或「今天好吗？」，跟朋友下班小聚一下的时候适合用。
4. What’s up? / What’s new?
意思较偏「有什么新鲜事？」，久而久之就变成打招呼用语了，What’s up 念快一点也有人说 tsup, whassup, whudup。
5. I haven’t seen you in ages! / Long time no see. / Look who it is!
这几句适合对许久未见的好友，意思像「好久没看到你欸！」、「看看这谁啊？」。
6. How’s it hanging? / How’s life treating you?
How’s it hanging? 意思像中文的「最近混得怎样啊？」、而 How’s life treating you? 的意思像「日子过得如何阿？」，熟人朋友适用。
7. What have you been doing? / What have you been up to lately?
意思像「你最近都在干嘛阿？」，问近况时适用。
8. hey / hi / hello / yo
经典中的经典，世界通用语！
