ought to foil
Regular verb: foil - foiled- foiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to foil
you ought to foil
he ought to foil
we ought to foil
you ought to foil
they ought to foil 	I ought to be foiling
you ought to be foiling
he ought to be foiling
we ought to be foiling
you ought to be foiling
they ought to be foiling	I ought to have foiled
you ought to have foiled
he ought to have foiled
we ought to have foiled
you ought to have foiled
they ought to have foiled	I ought to have been foiling
you ought to have been foiling
he ought to have been foiling
we ought to have been foiling
you ought to have been foiling
they ought to have been foiling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to foil
you oughtn't to foil
he oughtn't to foil
we oughtn't to foil
you oughtn't to foil
they oughtn't to foil 	I oughtn't to be foiling
you oughtn't to be foiling
he oughtn't to be foiling
we oughtn't to be foiling
you oughtn't to be foiling
they oughtn't to be foiling	I oughtn't to have foiled
you oughtn't to have foiled
he oughtn't to have foiled
we oughtn't to have foiled
you oughtn't to have foiled
they oughtn't to have foiled	I oughtn't to have been foiling
you oughtn't to have been foiling
he oughtn't to have been foiling
we oughtn't to have been foiling
you oughtn't to have been foiling
they oughtn't to have been foiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I foil?
ought to you foil?
ought to he foil?
ought to we foil?
ought to you foil?
ought to they foil? 	ought to I be foiling?
ought to you be foiling?
ought to he be foiling?
ought to we be foiling?
ought to you be foiling?
ought to they be foiling? 	ought to I have foiled?
ought to you have foiled?
ought to he have foiled?
ought to we have foiled?
ought to you have foiled?
ought to they have foiled? 	ought to I have been foiling?
ought to you have been foiling?
ought to he have been foiling?
ought to we have been foiling?
ought to you have been foiling?
ought to they have been foiling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to foil?
oughtn't you to foil?
oughtn't he to foil?
oughtn't we to foil?
oughtn't you to foil?
oughtn't they to foil? 	oughtn't I to be foiling?
oughtn't you to be foiling?
oughtn't he to be foiling?
oughtn't we to be foiling?
oughtn't you to be foiling?
oughtn't they to be foiling? 	oughtn't I to have foiled?
oughtn't you to have foiled?
oughtn't he to have foiled?
oughtn't we to have foiled?
oughtn't you to have foiled?
oughtn't they to have foiled? 	oughtn't I to have been foiling?
oughtn't you to have been foiling?
oughtn't he to have been foiling?
oughtn't we to have been foiling?
oughtn't you to have been foiling?
oughtn't they to have been foiling?