Greetings in Passing
It is polite to greet a person you know. However, you don't always have time to stop and have a conversation. Just remember to smile as you say hello. A small wave is also polite. Sometimes you pass the same person a second time on the same day. You can say "hello again" or just smile.
跟認識的人打招呼是有禮貌的體現，但是你們並不會每次都有時間停下來談談。只要記住說「你好」的時候帶上微笑就行了，另外輕輕招手也會顯得很禮貌。有些時候你可能在同一天再次碰到這個人，那時你可以說"hello again"，或者僅用微笑示意。
Tips
·Slow down to greet someone you know. You don't have to stop what you are doing (walking, working, shopping).
放慢動作來同認識的人打招呼，不必停下（腳步，工作，購物）。
·Say an appropriate form of hello.
選擇正確的打招呼方式。
·Smile and wave.
微笑+揮手。
Useful phrases
·Hello
·Hi
·Good morning
·Good afternoon
·Good evening*
·Hey, John.
·How's it goin'?**
*Good night is a farewell(goodbye) phrase. It is NOT a greeting to use at night time.
"Good night."是用來告別（再見）的短語，並不是晚間打招呼的說法。
**Native speakers often shorten "going" to "goin" in casual greetings.
母語者在比較隨意地問候時經常將"going"縮略說成"goin"。
Slang greetings in passing
Using slangin a greeting is typicalbetween close friends. Teens often use slang when they greet each other. Certain English speaking countries also have their own popular form of "hello".
用俚語來打招呼經常發生在好朋友間，年輕人見面時常用俚語互相致意，而每個英語(論壇)國家也有自己所流行的問候方式。
·Howdy
·Hiya
·Whazzup?
·Yo
·G'day (Australia)
