I'd be designing you'd be designing he'd be designing we'd be designing you'd be designing they'd be designing
Perfect
I should've designed you should've designed he should've designed we should've designed you should've designed they should've designed
V-ing perfect
I should've been designing you should've been designing he should've been designing we should've been designing you should've been designing they should've been designing
Negation
Simple form
I shouldn't design you shouldn't design he shouldn't design we shouldn't design you shouldn't design they shouldn't design
V-ing form
I shouldn't be designing you shouldn't be designing he shouldn't be designing we shouldn't be designing you shouldn't be designing they shouldn't be designing
Perfect
I shouldn't have designed you shouldn't have designed he shouldn't have designed we shouldn't have designed you shouldn't have designed they shouldn't have designed
V-ing perfect
I shouldn't have been designing you shouldn't have been designing he shouldn't have been designing we shouldn't have been designing you shouldn't have been designing they shouldn't have been designing
Interrogative form
Simple form
should I design? should you design? should he design? should we design? should you design? should they design?
V-ing form
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
should I have designed? should you have designed? should he have designed? should we have designed? should you have designed? should they have designed?
V-ing perfect
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
shouldn't I design? shouldn't you design? shouldn't he design? shouldn't we design? shouldn't you design? shouldn't they design?
V-ing form
shouldn't I be designing? shouldn't you be designing? shouldn't he be designing? shouldn't we be designing? shouldn't you be designing? shouldn't they be designing?
Perfect
shouldn't I have designed? shouldn't you have designed? shouldn't he have designed? shouldn't we have designed? shouldn't you have designed? shouldn't they have designed?
V-ing perfect
shouldn't I have been designing? shouldn't you have been designing? shouldn't he have been designing? shouldn't we have been designing? shouldn't you have been designing? shouldn't they have been designing?