should dull
Regular verb: dull - dulled- dulled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should dull
you should dull
she should dull
we should dull
you should dull
they should dull 	I should be dulling
you should be dulling
she should be dulling
we should be dulling
you should be dulling
they should be dulling	I should have dulled
you should have dulled
she should have dulled
we should have dulled
you should have dulled
they should have dulled	I should have been dulling
you should have been dulling
she should have been dulling
we should have been dulling
you should have been dulling
they should have been dulling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not dull
you should not dull
she should not dull
we should not dull
you should not dull
they should not dull 	I should not be dulling
you should not be dulling
she should not be dulling
we should not be dulling
you should not be dulling
they should not be dulling	I should not have dulled
you should not have dulled
she should not have dulled
we should not have dulled
you should not have dulled
they should not have dulled	I should not have been dulling
you should not have been dulling
she should not have been dulling
we should not have been dulling
you should not have been dulling
they should not have been dulling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I dull?
should you dull?
should she dull?
should we dull?
should you dull?
should they dull? 	should I be dulling?
should you be dulling?
should she be dulling?
should we be dulling?
should you be dulling?
should they be dulling? 	should I have dulled?
should you have dulled?
should she have dulled?
should we have dulled?
should you have dulled?
should they have dulled? 	should I have been dulling?
should you have been dulling?
should she have been dulling?
should we have been dulling?
should you have been dulling?
should they have been dulling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not dull?
should you not dull?
should she not dull?
should we not dull?
should you not dull?
should they not dull? 	should I not be dulling?
should you not be dulling?
should she not be dulling?
should we not be dulling?
should you not be dulling?
should they not be dulling? 	should I not have dulled?
should you not have dulled?
should she not have dulled?
should we not have dulled?
should you not have dulled?
should they not have dulled? 	should I not have been dulling?
should you not have been dulling?
should she not have been dulling?
should we not have been dulling?
should you not have been dulling?
should they not have been dulling?