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Greetings/Phrases
Hello - konnichi wa
Hello [phone] - moshi moshi
Good morning - ohayo [gozaimasu]
Good afternoon - konnichi ha
Good evening - konban ha
Good night - oyasumi [nasai]
Good bye - sayounara
See ya later - mata ne/ja ne/ja matta
Hey - ooi
I love you - aishiteru
Wait/just a moment - chotto/chotto matte
Nice to meet you - hajimemashite
Thank you - domo arigatou [gozaimasu]
Give me [please] - onegai - kudasai
I'm sorry - gomen [nasai]
Best regards - yoroshiku
That was a good meal - gochisousama
Happy birthday - tanjoubi omedetou
Lets eat - itadakimasu
No way! - masuka
Oh no! - eee!/uso!/maji!/chigauyo!!
Really? Seriously? - hontou?
Um...lets see... - eeto/ano

People/Things/Etc.
everybody/all - minna
girl - shoujo/onnanoko
boy - shounen/otokonoko
woman - jyosei/onnanohito
man - dansei/otokonohito
cute boy - bishounen
Father - otousan
Mother - okaasan
today - kyou
tomorrow - ashita
day before yesterday - asatte
sometime - tokidoki
rest/break - yasumi
delicious - oishii
food - tabemono
cute - kawaii
love - koi/ai/suki
cat - neko
dog - inu
friend - tomodachi
god - kami
car - kuruma
music - ongaku
promise - yakusoku
house - ie
school - gakkou
teacher - sensei
dream - yume
wish - negai
sword - ken/katana
sing -utau
world - sekai
fairy - yousei
good - yoi
bad - warui
more - motto
bunny - usagi
mouse - nezumi
flower - hana
cold - samui
hot - atsui
light - hikari
dark - ankoku
rainbow - niji
sky - sora
color - iro
magic - mahou
spell - jumon
cool! - kakkoii
nerd - otaku
stupid/idiot - baka
succeed/happy/good - yatta!/sugoi
funny - okashii/omoshiroi
miniature version [of something] - chibi