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