should duck
Regular verb: duck - ducked- ducked

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