Here's the answer:
“私は特に妹と仲がいいです”
(watashi wa toku ni imōto to nakaga ī desu)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- 特に妹と仲がいいです
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 89.78% of the time!
