1.   Ed felt guilty about leaving work so early.

2.   Frankly, I never used to feel guilty about disappointing inanimate objects.

3.   He felt guilty about lying to his parents.

4.   I feel guilty about getting ratty with the children.

5.   I feel mildly guilty about accepting such hospitality.

6.   One feels guilty about not having understood better what was going on.

7.   Perhaps you felt guilty about ignoring a charity collection, and so Decided to punish yourself?

8.   She feels guilty about spending less time lately with her two kids.

9.   ...so they can feel less guilty about their piles of filthy lucre.

10.   He felt guilty about thinking this.