Here's the answer:
“こんにちは”
(konnichiwa)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 93.62% of the time!
(konnichiwa)
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 93.62% of the time!