hajimemashite – How do you do / Pleased to meet you
ohayō – Hello
ohayō gozaimasu – Good morning
konnichiwa – Good afternoon
konbanwa – Good evening
sayōnara – Goodbye
ja mata – See you
mata ashita – See you tomorrow
oyasumi nasai – Good night
ittekimasu (answer: itterasshai) – bye (when exiting)
tadaima (answer: okaerinasai) – hello (when returning)