should countersink
Irregular verb: countersink - countersank- countersunk

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should countersink
you should countersink
she should countersink
we should countersink
you should countersink
they should countersink 	I should be countersinking
you should be countersinking
she should be countersinking
we should be countersinking
you should be countersinking
they should be countersinking	I should have countersunk
you should have countersunk
she should have countersunk
we should have countersunk
you should have countersunk
they should have countersunk	I should have been countersinking
you should have been countersinking
she should have been countersinking
we should have been countersinking
you should have been countersinking
they should have been countersinking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not countersink
you should not countersink
she should not countersink
we should not countersink
you should not countersink
they should not countersink 	I should not be countersinking
you should not be countersinking
she should not be countersinking
we should not be countersinking
you should not be countersinking
they should not be countersinking	I should not have countersunk
you should not have countersunk
she should not have countersunk
we should not have countersunk
you should not have countersunk
they should not have countersunk	I should not have been countersinking
you should not have been countersinking
she should not have been countersinking
we should not have been countersinking
you should not have been countersinking
they should not have been countersinking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I countersink?
should you countersink?
should she countersink?
should we countersink?
should you countersink?
should they countersink? 	should I be countersinking?
should you be countersinking?
should she be countersinking?
should we be countersinking?
should you be countersinking?
should they be countersinking? 	should I have countersunk?
should you have countersunk?
should she have countersunk?
should we have countersunk?
should you have countersunk?
should they have countersunk? 	should I have been countersinking?
should you have been countersinking?
should she have been countersinking?
should we have been countersinking?
should you have been countersinking?
should they have been countersinking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not countersink?
should you not countersink?
should she not countersink?
should we not countersink?
should you not countersink?
should they not countersink? 	should I not be countersinking?
should you not be countersinking?
should she not be countersinking?
should we not be countersinking?
should you not be countersinking?
should they not be countersinking? 	should I not have countersunk?
should you not have countersunk?
should she not have countersunk?
should we not have countersunk?
should you not have countersunk?
should they not have countersunk? 	should I not have been countersinking?
should you not have been countersinking?
should she not have been countersinking?
should we not have been countersinking?
should you not have been countersinking?
should they not have been countersinking?