(good morning) ohayo/ohayo gozaimasu-おはよう／おはようございました-ohayo is used for your friends or whatsoever, but when you use ohayo gozaimashita its more polite than the simple ohayo....so better use dat...

(thank you) arigatou/arigato gozaimashita/arigatou gozaimasu- ありがとう／ありがとうございました／ありがとうございます- well the second and the third one is used when oler than you or whatever. if you want to be polite, use dat.

(good night)oyasumi/oyasuminasai- おやすみ/おやすみなさい- 2nd one(polite)

(A/N: (nasai, gozaimashita, gozaimasu are all polite words))

(hello, good afternoon)konnichiwa/(good evening)konbanwa-こんいちわ/こんばんわ

(hello---phone only) moshi moshi-もしもし- hello in phone ONLY (btw...nobody listens that moshi moshi is only used for phone calls T_T)

if you want me to add something or if you have any questions, pm me. and i will TRY to answer it.