根据上下文内容将划线部分译成汉语。
⑴We say hello to people every day．⑵We use different（不同的）words in different places（地方）and to different people．
At school we say hello to a teacher in a formal way（用正式的方式）． The examples（例子）are：“Good morning，Mrs Yang”or“Good after- noon，Mr Wang”．⑶But we often say hello to a classmate in an informal way．For example，“Hi”or“Hello”．
⑷When you meet a stranger（陌生人）in a public place（在公共场所），you can GREet（问候）him in a formal way，such as，“How do you do？”“It's very nice to meet you．”“Good morning．It's good to meet you．”and you can greet an old friend in an informal way，“Hi，”“Hello”，“Hi，how's everything？”“Hello，how are you？”
⑸GREetings are important in our everyday life．We must learn and use them well．
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