should postmark
Regular verb: postmark - postmarked- postmarked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd postmark
you'd postmark
she'd postmark
we'd postmark
you'd postmark
they'd postmark 	I'd be postmarking
you'd be postmarking
she'd be postmarking
we'd be postmarking
you'd be postmarking
they'd be postmarking	I should've postmarked
you should've postmarked
she should've postmarked
we should've postmarked
you should've postmarked
they should've postmarked	I should've been postmarking
you should've been postmarking
she should've been postmarking
we should've been postmarking
you should've been postmarking
they should've been postmarking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't postmark
you shouldn't postmark
she shouldn't postmark
we shouldn't postmark
you shouldn't postmark
they shouldn't postmark 	I shouldn't be postmarking
you shouldn't be postmarking
she shouldn't be postmarking
we shouldn't be postmarking
you shouldn't be postmarking
they shouldn't be postmarking	I shouldn't have postmarked
you shouldn't have postmarked
she shouldn't have postmarked
we shouldn't have postmarked
you shouldn't have postmarked
they shouldn't have postmarked	I shouldn't have been postmarking
you shouldn't have been postmarking
she shouldn't have been postmarking
we shouldn't have been postmarking
you shouldn't have been postmarking
they shouldn't have been postmarking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I postmark?
should you postmark?
should she postmark?
should we postmark?
should you postmark?
should they postmark? 	should I be postmarking?
should you be postmarking?
should she be postmarking?
should we be postmarking?
should you be postmarking?
should they be postmarking? 	should I have postmarked?
should you have postmarked?
should she have postmarked?
should we have postmarked?
should you have postmarked?
should they have postmarked? 	should I have been postmarking?
should you have been postmarking?
should she have been postmarking?
should we have been postmarking?
should you have been postmarking?
should they have been postmarking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I postmark?
shouldn't you postmark?
shouldn't she postmark?
shouldn't we postmark?
shouldn't you postmark?
shouldn't they postmark? 	shouldn't I be postmarking?
shouldn't you be postmarking?
shouldn't she be postmarking?
shouldn't we be postmarking?
shouldn't you be postmarking?
shouldn't they be postmarking? 	shouldn't I have postmarked?
shouldn't you have postmarked?
shouldn't she have postmarked?
shouldn't we have postmarked?
shouldn't you have postmarked?
shouldn't they have postmarked? 	shouldn't I have been postmarking?
shouldn't you have been postmarking?
shouldn't she have been postmarking?
shouldn't we have been postmarking?
shouldn't you have been postmarking?
shouldn't they have been postmarking?