ought to concave
Regular verb: concave - concaved- concaved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to concave
you ought to concave
he ought to concave
we ought to concave
you ought to concave
they ought to concave 	I ought to be concaving
you ought to be concaving
he ought to be concaving
we ought to be concaving
you ought to be concaving
they ought to be concaving	I ought to have concaved
you ought to have concaved
he ought to have concaved
we ought to have concaved
you ought to have concaved
they ought to have concaved	I ought to have been concaving
you ought to have been concaving
he ought to have been concaving
we ought to have been concaving
you ought to have been concaving
they ought to have been concaving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to concave
you oughtn't to concave
he oughtn't to concave
we oughtn't to concave
you oughtn't to concave
they oughtn't to concave 	I oughtn't to be concaving
you oughtn't to be concaving
he oughtn't to be concaving
we oughtn't to be concaving
you oughtn't to be concaving
they oughtn't to be concaving	I oughtn't to have concaved
you oughtn't to have concaved
he oughtn't to have concaved
we oughtn't to have concaved
you oughtn't to have concaved
they oughtn't to have concaved	I oughtn't to have been concaving
you oughtn't to have been concaving
he oughtn't to have been concaving
we oughtn't to have been concaving
you oughtn't to have been concaving
they oughtn't to have been concaving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I concave?
ought to you concave?
ought to he concave?
ought to we concave?
ought to you concave?
ought to they concave? 	ought to I be concaving?
ought to you be concaving?
ought to he be concaving?
ought to we be concaving?
ought to you be concaving?
ought to they be concaving? 	ought to I have concaved?
ought to you have concaved?
ought to he have concaved?
ought to we have concaved?
ought to you have concaved?
ought to they have concaved? 	ought to I have been concaving?
ought to you have been concaving?
ought to he have been concaving?
ought to we have been concaving?
ought to you have been concaving?
ought to they have been concaving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to concave?
oughtn't you to concave?
oughtn't he to concave?
oughtn't we to concave?
oughtn't you to concave?
oughtn't they to concave? 	oughtn't I to be concaving?
oughtn't you to be concaving?
oughtn't he to be concaving?
oughtn't we to be concaving?
oughtn't you to be concaving?
oughtn't they to be concaving? 	oughtn't I to have concaved?
oughtn't you to have concaved?
oughtn't he to have concaved?
oughtn't we to have concaved?
oughtn't you to have concaved?
oughtn't they to have concaved? 	oughtn't I to have been concaving?
oughtn't you to have been concaving?
oughtn't he to have been concaving?
oughtn't we to have been concaving?
oughtn't you to have been concaving?
oughtn't they to have been concaving?