should countersink
Irregular verb: countersink - countersank- countersunk

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