4. Is swimming under water very difficult? - No, it's just a matter _____ able to control your breathing. A. to be B. of being C. that you are D. if you had "B. of being" is correct. However, how can I explain that "C. that you are" is not correct? Many thanks.
Top answer
I don't think there any other explanation than the fact that a matter of is a fixed phrase, even without able: It's a matter of time. CB
— Cool Breeze
I don't think there any other explanation than the fact that a matter of is a fixed phrase, even without able: It's a matter of time.
CB
Free · every Monday
Get the Weekly English Kit 📬
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.