1. Goodbye!
再见！
还能这样说：
See you.
Catch you later.
应用解析：
kiss sth. goodbye/kiss goodbye to sth. 永远放弃某事；
the kiss of life 口对口的人工呼吸
2. Farewell until we meet again!
下次再见！
还能这样说：
Farewell! I hope we meet soon.
See you next time!
应用解析：
make one's last farewells 做最后告别；
a farewell address 告别词；
farewell dinner 饯行宴会；
a farewell meeting 欢送会；
farewell to life 辞世，死
3. Today I come to say goodbye to you, for I'm going back to China tomorrow.
我今天来是向你告别的，因为明天我就要回中国了。
还能这样说：
I'd like to bid farewell to you, because I am going back to China tomorrow.
I just come to part from you because I am leaving for China tomorrow.
谚语：
Scratch my back and I'll scratch yours.
你捧我，我捧你。
4. I waved them goodbye.
我向他们挥手道别。
还能这样说：
I waved farewell to them.
I waved off them.
应用解析：
wave a sword 挥剑；
wave one's hair 替某人烫发；
brain wave 突如其来的灵感；巧妙的主意；
a wave of emotion 情绪的高涨；
waves of people 人潮汹涌
5. Take care of yourself and don't forget to keep in touch.
保重，别忘了常联系。
还能这样说：
Be careful of yourself and let us keep in touch with each other!
Please do take care of yourself and keep in track with me.
谚语：
Take care of the pence and the pounds will take care of themselves.
节约便士，金镑自然会积累起来。
6. I will miss you.
我会想念你的。
还能这样说：
I am going to miss you.
I would like to miss you.
谚语：
A miss is as good as a mile.
失之毫厘，差之千里。
7. Kiss me goodbye!
向我吻别吧！
还能这样说：
Give me a goodbye kiss.
Kiss me farewell.
应用解析：
a Judah's kiss 犹大的吻；口蜜腹剑；阴险的背叛；
snatch a kiss 冷不防接个吻；
steal a kiss 偷吻；
kiss of death 致命之吻
8. Every parting from you is like eternity.
每一次和你分别都有些像永别。
还能这样说：
Every parting from you makes me feel that we will never meet again.
It seems that every parting from you is forever parting.
应用解析：
act one's part well 演得好；
a woman of parts 有才华的女人；
do one's part 尽自己本分；
part one's hometown 离别故乡；
part company with 和……分手；和……意见不合