はい Hai. Yes.
いいえ iie. No.
おねがい します Onegai shimasu. Please.
こんにちわ Konnichiwa. Hello / Good day.
おはよう ございます Ohayō gozaimasu. Good morning.
はじめまして Hajimemashite. Nice to meet you (for the first time)
もしもし Moshi moshi. “Hello?” ( greeting on the phone)
すみません Sumimasen. Excuse me (formal)

誰 (Dare: “Who?”)
何 (Nani or Nan: “What?”)
いつ (Itsu: “When?”)
どこ (Doko: “Where?”)
どうして (Doushite: Why?)
どう (Dou: “How?”)
どちら? (Dochira: “Which?”)

お名前は何ですか (Onamae wa Nan desu ka “What’s your name?”)

いくらですか (Ikura desu ka: “How much Is It?”)

わかりますか (Wakarimasu ka: “Do you understand?”)

はどこですか (* wa Doko desu ka*: “Where is the ___?”)

これは何ですか (Kore wa Nan desu ka: “What’s this?”)

これは何意味ですか (Kore wa Nan Imi desu ka: “What does this mean?”)

英語を話せますか (Eigo wo Hanasemasu ka: “Can you speak English?”)

_ がありますか (ga Arimasu ka: “Do you have _?”)
If you’re talking to a friend, you can shorten it by saying があるの? ( ga aru no?)

大丈夫ですか (Daijoubu desu ka: “Are you okay?”)
You can answer, “はい、大丈夫です” (Hai, daijoubu desu: “Yes, I’m fine”) or “いいえ、ちょっと悪いです” (Iie, chotto warui desu: “No, I’m feeling a bit bad/sick”).

どうしたんだ (Doushitanda: “What happened?”)
You may hear, “別に” (Betsu ni: “Nothing”), if it was no big deal or they don’t want to explain.

いつは会えますか (Itsu wa Aemasu ka: “When Can We Meet?”)

すごい!(Sugoi: “Wow!” or “Amazing!”)
I promise you, if you reply すごい to most everything that has a positive tone and body language, you'll sound like a native. This is hands down the most overused word in Japanese, and it’s a reply to everything. In fact, you’ll probably hear “すごい!” in reply to your attempt to speak Japanese!

ヤバい (Yabai: “Uncool”)
The opposite of すごい, this means something is uncool or terrible.

ちょ、めっちゃ、とっても (Cho, Meccha, Tottemo: “Very,” “Super”)
Depending on the dialect, you’ll hear one of these three words to say something is “very __.” てっても (tottemo) is most standard, and the small つ means it has extra emphasis.

マジで (Maji de: “Seriously,” “Really”)
Like ちょ, マジ is used as an intensifier, but this one is more masculine.

うそ! (Uso!: “No way!”)
It actually means “a lie,” but it used as “no way!” in casual conversation when you hear something unbelievable.