3. 告别Farewell
Goodbye!(Bye-bye!Bye!)
See you later / tomorrow. (See you.)
Good night.
[解析]Goodbye!是用于正式场合的"再见!"
Bye-bye!与Bye!常用在口语中,并且是熟人之间比较随便的告别语或儿语.类似的说法有:See you later. / See you tomorrow. / See you.
晚上道别,尤其是在睡觉前的道别,要用Good night!而不用Goodbye!之类的用语.