I'd be ducking you'd be ducking she'd be ducking we'd be ducking you'd be ducking they'd be ducking
Perfect
I should've ducked you should've ducked she 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 she 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 she 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 she 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 she 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 she 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 she duck? should we duck? should you duck? should they duck?
V-ing form
should I be ducking? should you be ducking? should she be ducking? should we be ducking? should you be ducking? should they be ducking?
Perfect
should I have ducked? should you have ducked? should she 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 she 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 she 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 she 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 she 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 she have been ducking? shouldn't we have been ducking? shouldn't you have been ducking? shouldn't they have been ducking?