In addition..
so long
gotta run, later
farewell
good day/night
night- night (for kids and lovers before they went to sleep)
till tomorrow
talk you you later
or just for fun you can say it in another languages
adieu
au revoir
ciao
bis dann
.. and so on.
2010年8月25日
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till next time..
got to go..
see you around..
i have to leave..
2010年11月25日
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do not forget:
let's stay friends.
Hasta la vista.
f*** off
in internet speaking you may encounter
bb - bye bye
:D
2010年10月24日
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in nz we have lots of slang:
laters
chur
you could also say:
laters co/bro/cuz
but besides nz slang, you could say:
see ya(very common)
but other than that and what you said, there are no other common ways to say it...only formal:(