01.It has been a long time./ It's been too long.
好久不见了。
02.What have you been up to all these years?
这些年过得好吗？
03.It's always a pleasure to see you.
见到你总是很开心。
04.How long has it been?
有多久了？
05.I'm so happy to see you again.
再次见到你真开心。
06.How come I never see you? (informal)
相见恨晚啊！（非正式）
07.It's been such a long time. (informal)/ Long time no see. (informal) / It's been ages since we last met. (informal)
好久不见。 (非正式）
08.Good morning.
早上好！
09.Good afternoon.
下午好！
10.Good evening.
晚上好！
11.Have a good night!
晚安！
12.Have a good rest!
好好休息！
13.Enjoy your meal!
用餐愉快！