English verb conjugation
SHOULD RETAIN

Regular verb: retain - retained - retained

Affirmation

Simple form	V-ing form
I'd retain you'd retain she'd retain we'd retain you'd retain they'd retain	I'd be retaining you'd be retaining she'd be retaining we'd be retaining you'd be retaining they'd be retaining
Perfect	V-ing perfect
I should've retained you should've retained she should've retained we should've retained you should've retained they should've retained	I should've been retaining you should've been retaining she should've been retaining we should've been retaining you should've been retaining they should've been retaining

Negation

Simple form	V-ing form
I shouldn't retain you shouldn't retain she shouldn't retain we shouldn't retain you shouldn't retain they shouldn't retain	I shouldn't be retaining you shouldn't be retaining she shouldn't be retaining we shouldn't be retaining you shouldn't be retaining they shouldn't be retaining
Perfect	V-ing perfect
I shouldn't have retained you shouldn't have retained she shouldn't have retained we shouldn't have retained you shouldn't have retained they shouldn't have retained	I shouldn't have been retaining you shouldn't have been retaining she 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	V-ing form
should I retain? should you retain? should she retain? should we retain? should you retain? should they retain?	should I be retaining? should you be retaining? should she be retaining? should we be retaining? should you be retaining? should they be retaining?
Perfect	V-ing perfect
should I have retained? should you have retained? should she have retained? should we have retained? should you have retained? should they have retained?	should I have been retaining? should you have been retaining? should she have been retaining? should we have been retaining? should you have been retaining? should they have been retaining?

Interro-negative form

Simple form	V-ing form
shouldn't I retain? shouldn't you retain? shouldn't she retain? shouldn't we retain? shouldn't you retain? shouldn't they retain?	shouldn't I be retaining? shouldn't you be retaining? shouldn't she be retaining? shouldn't we be retaining? shouldn't you be retaining? shouldn't they be retaining?
Perfect	V-ing perfect
shouldn't I have retained? shouldn't you have retained? shouldn't she have retained? shouldn't we have retained? shouldn't you have retained? shouldn't they have retained?	shouldn't I have been retaining? shouldn't you have been retaining? shouldn't she have been retaining? shouldn't we have been retaining? shouldn't you have been retaining? shouldn't they have been retaining?