ought to countersink
Irregular verb: countersink - countersank- countersunk

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to countersink
you ought to countersink
he ought to countersink
we ought to countersink
you ought to countersink
they ought to countersink 	I ought to be countersinking
you ought to be countersinking
he ought to be countersinking
we ought to be countersinking
you ought to be countersinking
they ought to be countersinking	I ought to have countersunk
you ought to have countersunk
he ought to have countersunk
we ought to have countersunk
you ought to have countersunk
they ought to have countersunk	I ought to have been countersinking
you ought to have been countersinking
he ought to have been countersinking
we ought to have been countersinking
you ought to have been countersinking
they ought to have been countersinking	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I countersink?
ought to you countersink?
ought to he countersink?
ought to we countersink?
ought to you countersink?
ought to they countersink? 	ought to I be countersinking?
ought to you be countersinking?
ought to he be countersinking?
ought to we be countersinking?
ought to you be countersinking?
ought to they be countersinking? 	ought to I have countersunk?
ought to you have countersunk?
ought to he have countersunk?
ought to we have countersunk?
ought to you have countersunk?
ought to they have countersunk? 	ought to I have been countersinking?
ought to you have been countersinking?
ought to he have been countersinking?
ought to we have been countersinking?
ought to you have been countersinking?
ought to they have been countersinking? 	

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