From 1 p.m. until let’s say 6 p.m.,
you say “Buon pomeriggio”.
下午1点到6点，你说“下午好”。
Then from 6:30/7 p.m. to 8 p.m., you say “Buonasera”.
然后，晚上6点半/7点到8点，你说“晚上好”。
And from 8 till midnight, you say “Buonanotte”.
晚上8点到半夜，你说“晚安”。（一般是睡前说）
You have a common “Ciao” used with friends and
family. So it’s low register, quite informal. You
can say “Ciao” both when you meet someone and
when you leave.
通常，你可以和家人和朋友说“Ciao”，这个词非常随意。
可以用于表达“你好”和“再见”。
