Our problem is not having sufficient raw material.
His not coming made everyone present very disappointed.
Not being punctual makes him unreliable.
Not being tall is not a serious disadvantage in life.
Don't be angry with me for not having written.
Execuse me not having answered your letter before.
I apologize for not having kept my promise.
He doesn't like not being taken seriously.
As far as he's concerned.it's not doing something wrong that matters,but not being caught doing something wrong.
I'm surprised at your not having noticed.
I understand your not wanting to discuss the matter.
The trouble was their not being able to agree among themselves.
Jenny's not having been trained as a dancer is her one regret.