English verb conjugation
SHOULD RETAIN

Regular verb: retain - retained - retained

Affirmation

Simple form	V-ing form
I should retain you should retain he should retain we should retain you should retain they should retain	I should be retaining you should be retaining he should be retaining we should be retaining you should be retaining they should be retaining
Perfect	V-ing perfect
I should have retained you should have retained he should have retained we should have retained you should have retained they should have retained	I should have been retaining you should have been retaining he should have been retaining we should have been retaining you should have been retaining they should have been retaining

Negation

Simple form	V-ing form
I should not retain you should not retain he should not retain we should not retain you should not retain they should not retain	I should not be retaining you should not be retaining he should not be retaining we should not be retaining you should not be retaining they should not be retaining
Perfect	V-ing perfect
I should not have retained you should not have retained he should not have retained we should not have retained you should not have retained they should not have retained	I should not have been retaining you should not have been retaining he should not have been retaining we should not have been retaining you should not have been retaining they should not have been retaining

Interrogative form

Simple form	V-ing form
should I retain? should you retain? should he retain? should we retain? should you retain? should they retain?	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	V-ing 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?	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	V-ing form
should I not retain? should you not retain? should he not retain? should we not retain? should you not retain? should they not retain?	should I not be retaining? should you not be retaining? should he not be retaining? should we not be retaining? should you not be retaining? should they not be retaining?
Perfect	V-ing perfect
should I not have retained? should you not have retained? should he not have retained? should we not have retained? should you not have retained? should they not have retained?	should I not have been retaining? should you not have been retaining? should he not have been retaining? should we not have been retaining? should you not have been retaining? should they not have been retaining?