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This is all basic most popular phrases in Japanese. Best way to learn is to keep repeating the words and using them in daily convo with your friends.

Hello.
    Konnichiwa. (kon-nee-chee-WAH)

How are you?
    genki desu ka? (oh-GEN-kee dess-KAH?)

Fine thank you.
    Genki desu. (GEN-kee dess)

What is your name?
    O-namae wa nan desu ka?(oh-NAH-mah-eh wah NAHN dess-KAH?)

My name is ____ .
     Watashi no namae wa ____ desu. (wah-TAH-shee no nah-mah-eh wa ____ dess)

Nice to meet you.
    Hajimemashite. (hah-jee-meh-MOSH-teh)

Please. (request)
    Onegai shimasu. (oh-neh-gigh shee-moss)

Please. (offer)
    Dozo. (DOH-zo)

Thank you.
     Domo arigato. (doh-moh ah-ree-GAH-toh)

You're welcome.
     Do itashi mashite. (doh EE-tah-shee mosh-teh)

Yes.
     Hai. (HIGH)

No.
     Iie. (EE-eh)

Excuse me.
     Sumimasen. (soo-mee-mah-sen)

I'm sorry.
     Gomen-nasai. (goh-men-nah-sigh)

Goodbye. (long-term)
    Sayonara. (sa-YOH-nah-rah)

Goodbye. (informal)
    Sore dewa. (SOH-reh deh-wah)

I can't speak Japanese [well].
     Nihongo [yoku] hanasemasen. (nee-hohn-goh [yo-koo] hah-nah-seh-mah-sen)

Do you speak English?
     Eigo o hanasemasuka? (AY-goh oh hah-nah-seh-moss-KAH?)

Is there someone here who speaks English?
     Dareka eigo o hanasemasuka? (dah-reh-kah AY-goh oh hah-nah-seh-moss-KAH?)

Help!
    Tasukete! (tah-soo-keh-teh!)

Look out!
    Abunai! (ah-boo-NIGH!)

Good morning.
    Ohayo gozaimasu. (oh-hah-YOH go-zigh-moss)

Good evening.
     Konbanwa. (kohm-bahn-wah)

Good night (to sleep)
    Oyasuminasai. (oh-yah-soo-mee-nah-sigh)

I don't understand.
    Wakarimasen. (wah-kah-ree-mah-sen)

Where is the toilet?
     Toire wa doko desu ka? (toy-reh wah DOH-koh dess kah?

Stupid/Idiot/Fool
     Baka (bah-kah)

Sit (for animals)
     Osuwari (oh-saw-ree)