Konnichiwa (こんにちは) This word means “good day” or “good afternoon,” depending on the moment of the day you are using it. It is also the most used phrase to greet one another. Use it like it's free (it is!) with anyone you are in contact with, and you can use it from the morning till the afternoon.
The same as Ohayō gozaimasu, Konbanwa can be used both as a “hello” and as a “goodbye”. If you are leaving, you can also say Oyasumi nasai (おやすみなさい) to say “goodbye” in Japanese at night. But only when you leave as this Japanese phrase is not typically used as a greeting.
Konnichiwa (こんにちは) is said between late morning (11am) and early evening (5pm) in Japan. It's a formal kind of 'hello! '.
Moshi moshi, or もしもし, is a common Japanese phrase that Japanese people use when picking up the phone. It's a casual greeting used for friends and family, like a “hello”, but in fact means something entirely different! In English, it literally means something more like, “to say to say”, or “I speak I speak”.
After around 6pm or sunset, you can use konbanwa, which roughly translates to “good evening,” but literally means “tonight.” In contrast to “konnichiwa”, “konbanwa” sounds more formal, and most people don't use it with their close acquaintances.
Ittekimasu and Itterasshai
The phrase “Ittekimasu”, is typically used by a Japanese when they are about to leave somewhere, such as from the home or office. The closest literal translation would be “I'll go and I'll come back”.
Sayonara is a casual way to say goodbye, similar to phrases like "so long" or "see ya!" You might say sayonara to your traveling grandmother, or say sayonara to a terrible job at the end of a long summer. It's a Japanese word that has been a popular informal word in English since the late 1800s.
Konbanwa – こんばんは
Like konnichiwa, it's already sufficiently formal, so you can use it with anyone to greet them in the late afternoon or evening.
“Hello” – こんにちは (Konnichiwa) “Hello” on the phone – もしもし (Moshi moshi) “Good morning” – おはようございます (Ohayou gozaimasu) “Good Evening” – こんばんは (Konbanwa)
adieu, adios, arrivederci, au revoir, auf wiedersehen, bye, bye-bye, cheerio, good day, good-by, good-bye, goodby, goodbye, sayonara, so long.
Mata ne (see you later), ja ne (well then), or the even more casual bai bai (yes, the Japanification of bye bye) are your best bet. If you do know when you'll meet again, go for mata plus a date (ashita for tomorrow, or raishu for next week, etc).
Konnichiwa means “good day” or “good afternoon” and is the most used phrase to greet one another.
The first way to say good morning is ohayō おはよう (pronounced a lot like the state Ohio). This is the casual form, which you'd mainly use with close friends and family members. The second way to say good morning in Japanese is ohayō gozaimasu おはようございます. This is a more formal version.
If you say, "Bye!" you mean "farewell" or "so long." In other words, bye is a shorter way to say, "Goodbye."
The most common phrases when greeting someone familiar is “Ohayō gozaimasu” (Good morning), “Konnichiwa” ('Hello' or 'Good day'), and “Konbanwa” ('Good evening').
In Japan, people greet each other by bowing. A bow can ranges from a small nod of the head to a deep bend at the waist. A deeper, longer bow indicates respect and conversely a small nod with the head is casual and informal.
The simplest and most straightforward way of saying yes in Japanese is はい hai. In a more formal style, one may also use は！ ha!. If you are conversing with a close acquaintance, ええ ee is also suitable.