should curtain
Regular verb: curtain - curtained- curtained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should curtain
you should curtain
she should curtain
we should curtain
you should curtain
they should curtain 	I should be curtaining
you should be curtaining
she should be curtaining
we should be curtaining
you should be curtaining
they should be curtaining	I should have curtained
you should have curtained
she should have curtained
we should have curtained
you should have curtained
they should have curtained	I should have been curtaining
you should have been curtaining
she should have been curtaining
we should have been curtaining
you should have been curtaining
they should have been curtaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not curtain
you should not curtain
she should not curtain
we should not curtain
you should not curtain
they should not curtain 	I should not be curtaining
you should not be curtaining
she should not be curtaining
we should not be curtaining
you should not be curtaining
they should not be curtaining	I should not have curtained
you should not have curtained
she should not have curtained
we should not have curtained
you should not have curtained
they should not have curtained	I should not have been curtaining
you should not have been curtaining
she should not have been curtaining
we should not have been curtaining
you should not have been curtaining
they should not have been curtaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I curtain?
should you curtain?
should she curtain?
should we curtain?
should you curtain?
should they curtain? 	should I be curtaining?
should you be curtaining?
should she be curtaining?
should we be curtaining?
should you be curtaining?
should they be curtaining? 	should I have curtained?
should you have curtained?
should she have curtained?
should we have curtained?
should you have curtained?
should they have curtained? 	should I have been curtaining?
should you have been curtaining?
should she have been curtaining?
should we have been curtaining?
should you have been curtaining?
should they have been curtaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not curtain?
should you not curtain?
should she not curtain?
should we not curtain?
should you not curtain?
should they not curtain? 	should I not be curtaining?
should you not be curtaining?
should she not be curtaining?
should we not be curtaining?
should you not be curtaining?
should they not be curtaining? 	should I not have curtained?
should you not have curtained?
should she not have curtained?
should we not have curtained?
should you not have curtained?
should they not have curtained? 	should I not have been curtaining?
should you not have been curtaining?
should she not have been curtaining?
should we not have been curtaining?
should you not have been curtaining?
should they not have been curtaining?