can countersink
Irregular verb: countersink - countersank- countersunk

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't countersink
you can't countersink
she can't countersink
we can't countersink
you can't countersink
they can't countersink 	I can't be countersinking
you can't be countersinking
she can't be countersinking
we can't be countersinking
you can't be countersinking
they can't be countersinking	I can't have countersunk
you can't have countersunk
she can't have countersunk
we can't have countersunk
you can't have countersunk
they can't have countersunk	I can't have been countersinking
you can't have been countersinking
she can't have been countersinking
we can't have been countersinking
you can't have been countersinking
they can't have been countersinking	

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

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