Let's say you got only an hour to finish your work. Then, that hour is now finished, but you feel that there is something you didn't do. Few minutes after that, you see that you have really missed a part of your work, and you say:
''So that explains why I felt that there is something I didn't do huh.''
Or is this more correct:
''So that explains why I've been feeling that there is something I didn't do huh.''
This is a common expression that will benefit ESLs also. Is there better/correct expression for this?