Here's the answer:
“이 꽃들은 우리 엄마를 위한 것이에요”
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Korean with Memrise get this phrase correct 92.57% of the time!
Fun fact: the hundreds of thousands of people learning Korean with Memrise get this phrase correct 92.57% of the time!