Here's the answer:
“我不记得了”
(wǒ bú jì-dé le)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 91.3% of the time!
(wǒ bú jì-dé le)
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 91.3% of the time!