I'd be retaining you'd be retaining he'd be retaining we'd be retaining you'd be retaining they'd be retaining
Perfect
I should've retained you should've retained he should've retained we should've retained you should've retained they should've retained
V-ing perfect
I should've been retaining you should've been retaining he should've been retaining we should've been retaining you should've been retaining they should've been retaining
Negation
Simple form
I shouldn't retain you shouldn't retain he shouldn't retain we shouldn't retain you shouldn't retain they shouldn't retain
V-ing form
I shouldn't be retaining you shouldn't be retaining he shouldn't be retaining we shouldn't be retaining you shouldn't be retaining they shouldn't be retaining
Perfect
I shouldn't have retained you shouldn't have retained he shouldn't have retained we shouldn't have retained you shouldn't have retained they shouldn't have retained
V-ing perfect
I shouldn't have been retaining you shouldn't have been retaining he shouldn't have been retaining we shouldn't have been retaining you shouldn't have been retaining they shouldn't have been retaining
Interrogative form
Simple form
should I retain? should you retain? should he retain? should we retain? should you retain? should they retain?
V-ing form
should I be retaining? should you be retaining? should he be retaining? should we be retaining? should you be retaining? should they be retaining?
Perfect
should I have retained? should you have retained? should he have retained? should we have retained? should you have retained? should they have retained?
V-ing perfect
should I have been retaining? should you have been retaining? should he have been retaining? should we have been retaining? should you have been retaining? should they have been retaining?
Interro-negative form
Simple form
shouldn't I retain? shouldn't you retain? shouldn't he retain? shouldn't we retain? shouldn't you retain? shouldn't they retain?
V-ing form
shouldn't I be retaining? shouldn't you be retaining? shouldn't he be retaining? shouldn't we be retaining? shouldn't you be retaining? shouldn't they be retaining?
Perfect
shouldn't I have retained? shouldn't you have retained? shouldn't he have retained? shouldn't we have retained? shouldn't you have retained? shouldn't they have retained?
V-ing perfect
shouldn't I have been retaining? shouldn't you have been retaining? shouldn't he have been retaining? shouldn't we have been retaining? shouldn't you have been retaining? shouldn't they have been retaining?