English verb conjugation
OUGHT TO FORESTALL

Regular verb: forestall - forestalled - forestalled

Affirmation

Simple form	V-ing form
I ought to forestall you ought to forestall he ought to forestall we ought to forestall you ought to forestall they ought to forestall	I ought to be forestalling you ought to be forestalling he ought to be forestalling we ought to be forestalling you ought to be forestalling they ought to be forestalling
Perfect	V-ing perfect
I ought to have forestalled you ought to have forestalled he ought to have forestalled we ought to have forestalled you ought to have forestalled they ought to have forestalled	I ought to have been forestalling you ought to have been forestalling he ought to have been forestalling we ought to have been forestalling you ought to have been forestalling they ought to have been forestalling

Negation

Simple form	V-ing form
I oughtn't to forestall you oughtn't to forestall he oughtn't to forestall we oughtn't to forestall you oughtn't to forestall they oughtn't to forestall	I oughtn't to be forestalling you oughtn't to be forestalling he oughtn't to be forestalling we oughtn't to be forestalling you oughtn't to be forestalling they oughtn't to be forestalling
Perfect	V-ing perfect
I oughtn't to have forestalled you oughtn't to have forestalled he oughtn't to have forestalled we oughtn't to have forestalled you oughtn't to have forestalled they oughtn't to have forestalled	I oughtn't to have been forestalling you oughtn't to have been forestalling he oughtn't to have been forestalling we oughtn't to have been forestalling you oughtn't to have been forestalling they oughtn't to have been forestalling

Interrogative form

Simple form	V-ing form
ought to I forestall? ought to you forestall? ought to he forestall? ought to we forestall? ought to you forestall? ought to they forestall?	ought to I be forestalling? ought to you be forestalling? ought to he be forestalling? ought to we be forestalling? ought to you be forestalling? ought to they be forestalling?
Perfect	V-ing perfect
ought to I have forestalled? ought to you have forestalled? ought to he have forestalled? ought to we have forestalled? ought to you have forestalled? ought to they have forestalled?	ought to I have been forestalling? ought to you have been forestalling? ought to he have been forestalling? ought to we have been forestalling? ought to you have been forestalling? ought to they have been forestalling?

Interro-negative form

Simple form	V-ing form
oughtn't I to forestall? oughtn't you to forestall? oughtn't he to forestall? oughtn't we to forestall? oughtn't you to forestall? oughtn't they to forestall?	oughtn't I to be forestalling? oughtn't you to be forestalling? oughtn't he to be forestalling? oughtn't we to be forestalling? oughtn't you to be forestalling? oughtn't they to be forestalling?
Perfect	V-ing perfect
oughtn't I to have forestalled? oughtn't you to have forestalled? oughtn't he to have forestalled? oughtn't we to have forestalled? oughtn't you to have forestalled? oughtn't they to have forestalled?	oughtn't I to have been forestalling? oughtn't you to have been forestalling? oughtn't he to have been forestalling? oughtn't we to have been forestalling? oughtn't you to have been forestalling? oughtn't they to have been forestalling?