I should duck you should duck he should duck we should duck you should duck they should duck
V-ing form
I should be ducking you should be ducking he should be ducking we should be ducking you should be ducking they should be ducking
Perfect
I should have ducked you should have ducked he should have ducked we should have ducked you should have ducked they should have ducked
V-ing perfect
I should have been ducking you should have been ducking he should have been ducking we should have been ducking you should have been ducking they should have been ducking
Negation
Simple form
I should not duck you should not duck he should not duck we should not duck you should not duck they should not duck
V-ing form
I should not be ducking you should not be ducking he should not be ducking we should not be ducking you should not be ducking they should not be ducking
Perfect
I should not have ducked you should not have ducked he should not have ducked we should not have ducked you should not have ducked they should not have ducked
V-ing perfect
I should not have been ducking you should not have been ducking he should not have been ducking we should not have been ducking you should not have been ducking they should not 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
should I not duck? should you not duck? should he not duck? should we not duck? should you not duck? should they not duck?
V-ing form
should I not be ducking? should you not be ducking? should he not be ducking? should we not be ducking? should you not be ducking? should they not be ducking?
Perfect
should I not have ducked? should you not have ducked? should he not have ducked? should we not have ducked? should you not have ducked? should they not have ducked?
V-ing perfect
should I not have been ducking? should you not have been ducking? should he not have been ducking? should we not have been ducking? should you not have been ducking? should they not have been ducking?