Some useful expressions:
Arigatoo: Thank You.
Arigatoo gozaimasu: Thank you (formal).
Doo itashimashite: You are welcome.
Doomo: Thanks (very informal).
Doomo arigatoo: Thank you (informal).
Doomo arigatoo gozaimasu: Thank you very much (Very formal).
Hai: Yes.
Iie: No.
Kekkoo desu: No thanks.
Sumimasen: Excuse me, thank you.
When talking in Japanese, there might come a time when you forget how to say a word or just don't know what the other person is saying.

These phrases should come in handy!
Moo ichido onegai shimasu: Please say that again.
Wakarimasen: I don't understand.
Wakarimashita: I understood.
Chotto matte kudasai: Please wait a moment.
Object wa Nihongo de nan to iimasu ka: How do you say
object in Japanese?
eeto...: Umm... (lol I use this A LOT! ^.^)
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Here's a fabulous list of expressions made by 4jpz:
Good morning –
Ohayou gozaimasu. おはようございます。This is used until about 10 a.m. You can also say
Ohayou おはよう. This is the informal way, though.
Hello –
Konnichi wa. こんにちは。This is the informal greeting used after 10 a.m. until sunset.
Good evening –
Konban wa. こんばんは。
Good night –
Oyasumi nasai. おやすみなさい。This is mostly used before going to bed. When parting at night outside the home,
Itte kimasu いってきます is normally used.
Good bye –
Sayonara. さよなら。This is the casual way of saying goodbye.
Sayounara さようなら can be also used instead of “Sayonara”. One should use
Shitsurei shimasu for formal occasions.
Well then… or See you later -
Dewa mata. はまた is said informally when parting from friends or relatives.
So long –
Itte rasshai. いってらっしゃい. This literally means “Go and come back.” It is said to family members as they leave the house. Another form for “so long” is
Itte mairimasu which literally means “I’m going and coming back.” This is the reply for “Itte rasshai”
I’m back or I’m home –
Tadaima. This literally means “I have returned just now.” This is said upon arriving home.
Welcome home –
Okaeri nasai. This is the reply to “Tadaima.”
How are you? –
O-genki desu ka? This literally means “Are you well?”
Haven't seen you for a long time -
O-hisashiburi desu
Pleased to meet you –
Hajime mashite
Congratulations –
Omedeto gozaimazu
You’re welcome –
Do itashimashite
Once more, please –
Mo ichido onegaishimasu
Excuse me –
Sumi masen. This is said to attract ones attention. A different form of “excuse me” or “Pardon me” or “I’m sorry” is said when one has hurt someone else. In this scenario, one will say
Sumi masen deshita or
shitsurei shimasu or
Gomen nasai. Basically in Japanese, “excuse me” and I’m sorry” is similar.
Pardon my going first –
Osakini
Please –
Douzo. どうぞ This is used when offering something
Thank you –
Arigatou ありがとう or
Doumo どうも
Thank you very much –
Doumo arigatou gozaimasu どうもありがとうございます This is the the polite way.
Please (when requesting something) -
Kudasai
Please help me -
Chotto onegaishimasu. This is said when one is asking for an explanation. If one needs some heavy item to be moved, one will say
Chotto tetsudatte kudasai
Please, go ahead –
Dozo osakini.
Please show me –
Misete kudasai
Please write it –
Kaite kudasai
Please give me this –
Kore o kudasai
I'm sick –
Byoki desu
Let's go –
Ikimasho
Do you speak English? –
Anata wa eigo o hanashimasu ka?
Yes, I speak a little –
Hai, sukoshi hanashimasu
Do you understand? –
Wakarimasu ka?
Yes, I understand –
Hai, wakarimasu
I understood -
Wakarimashita
Oh, I see –
As, soo desu ka
No, I don't understand –
Iie, wakarimasen
Please say it again –
Mo ichido itte kudasai
Please speak slowly –
Yukkuri hanashi te kudasai
Please wait a moment –
Chotto matte kudasai
What is your name? –
Anata-no namae wa?
My name is _______ –
Watashino namae wa ________ desu
Where is it? –
Doko desu ka?
What time is it? –
Nan-ji desu ka?
How much is it? –
Sore wa ikura desu ka?
I will take it –
Sore kudasai
No, thank you –
Iie kekko desu
Do you like it? –
Suki desu ka?
I like it –
Suki desu
I don't like it –
Kirai desu
It's beautiful –
Kirei desu
Hello (on telephone only) –
Moshi moshi
Let me see –
So desu ne
Welcome –
Irrasshaimase
Where is the toilet? –
Toire wa doko desu ka?
Take care or be careful –
Ki o tsukete. This is said to someone who is going away but when someone is sick, one says
O dai ji ni.
Look out –
Abunai. This literally means “It’s dangerous.”
Out of the question or Impossible or No good –
Dame desu.
Keep your chin up! –
Gambatte kudasai. This is said to encourage someone.
Meaning we are going to eat now –
Itadakimasu.
Let's go to lunch –
O-hiru gohan ni iki masho?
Please speak slowly –
Yukkuri hanash'te kudasai
Please speak in English -
Eigo de hanash'te kudasai
Do the best you can -
Dekiru dake de ii desu. This is said to students.
I'm tired –
Tsukareta
See you tomorrow? -
Mata ashita. また明日
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Even more expressions compiled by micaheunice93:
ganbatte kudasai - good luck or do well
odaijini - get well soon
chotto matte kudasai - please wait a moment
osakini shitsurei shimasu - pardon my going first
douzo osakini - please go ahead
abunai - look out (it's dangerous)
itadakimasu - i will recieve this food
kara kimashita - i came from
nansai desuka? - how old are you?
naniga mondaidesuka? - what is the problem?
dokoe ikimasuka? - where are you going?
naniga hosiidesuka - what do you want?
gochisousama deshita - thank you for the food
kakenasai - please sit down
yukimasho - let's go
hontodesuka? - is it true?
sorewa dokoni arimasuka? - where is it?
genkodesu - fine,thank you
osokunatte sumimasen - sorry, i'm late
watakusiwa haraga hetta - i'm hungry
watakusiwa haraitbai - i'm full
haittemo iidesuka? - may i come in?
hanasite kudasai - please tell me
watakusiwa kankei arimasen - i don't care
osiede kudasai - please teach me
korewa nanno imidesuka? - what does this mean?
anata ga suki desu - i like you
aishite iru - love you
Some good Expressions by ainz0526 :
http://www.ampedasia.com/forums/expressi...#pid142804