English verb conjugation
SHOULD DESIGN

Regular verb: design - designed - designed

Affirmation

Simple form	V-ing form
I should design you should design he should design we should design you should design they should design	I should be designing you should be designing he should be designing we should be designing you should be designing they should be designing
Perfect	V-ing perfect
I should have designed you should have designed he should have designed we should have designed you should have designed they should have designed	I should have been designing you should have been designing he should have been designing we should have been designing you should have been designing they should have been designing

Negation

Simple form	V-ing form
I should not design you should not design he should not design we should not design you should not design they should not design	I should not be designing you should not be designing he should not be designing we should not be designing you should not be designing they should not be designing
Perfect	V-ing perfect
I should not have designed you should not have designed he should not have designed we should not have designed you should not have designed they should not have designed	I should not have been designing you should not have been designing he should not have been designing we should not have been designing you should not have been designing they should not have been designing

Interrogative form

Simple form	V-ing form
should I design? should you design? should he design? should we design? should you design? should they design?	should I be designing? should you be designing? should he be designing? should we be designing? should you be designing? should they be designing?
Perfect	V-ing perfect
should I have designed? should you have designed? should he have designed? should we have designed? should you have designed? should they have designed?	should I have been designing? should you have been designing? should he have been designing? should we have been designing? should you have been designing? should they have been designing?

Interro-negative form

Simple form	V-ing form
should I not design? should you not design? should he not design? should we not design? should you not design? should they not design?	should I not be designing? should you not be designing? should he not be designing? should we not be designing? should you not be designing? should they not be designing?
Perfect	V-ing perfect
should I not have designed? should you not have designed? should he not have designed? should we not have designed? should you not have designed? should they not have designed?	should I not have been designing? should you not have been designing? should he not have been designing? should we not have been designing? should you not have been designing? should they not have been designing?