Here's the answer:
“行きません”
(iki-masen)
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 94.85% of the time!
(iki-masen)
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 94.85% of the time!