I ought to filtrate you ought to filtrate he ought to filtrate we ought to filtrate you ought to filtrate they ought to filtrate
V-ing form
I ought to be filtrating you ought to be filtrating he ought to be filtrating we ought to be filtrating you ought to be filtrating they ought to be filtrating
Perfect
I ought to have filtrated you ought to have filtrated he ought to have filtrated we ought to have filtrated you ought to have filtrated they ought to have filtrated
V-ing perfect
I ought to have been filtrating you ought to have been filtrating he ought to have been filtrating we ought to have been filtrating you ought to have been filtrating they ought to have been filtrating
Negation
Simple form
I oughtn't to filtrate you oughtn't to filtrate he oughtn't to filtrate we oughtn't to filtrate you oughtn't to filtrate they oughtn't to filtrate
V-ing form
I oughtn't to be filtrating you oughtn't to be filtrating he oughtn't to be filtrating we oughtn't to be filtrating you oughtn't to be filtrating they oughtn't to be filtrating
Perfect
I oughtn't to have filtrated you oughtn't to have filtrated he oughtn't to have filtrated we oughtn't to have filtrated you oughtn't to have filtrated they oughtn't to have filtrated
V-ing perfect
I oughtn't to have been filtrating you oughtn't to have been filtrating he oughtn't to have been filtrating we oughtn't to have been filtrating you oughtn't to have been filtrating they oughtn't to have been filtrating
Interrogative form
Simple form
ought to I filtrate? ought to you filtrate? ought to he filtrate? ought to we filtrate? ought to you filtrate? ought to they filtrate?
V-ing form
ought to I be filtrating? ought to you be filtrating? ought to he be filtrating? ought to we be filtrating? ought to you be filtrating? ought to they be filtrating?
Perfect
ought to I have filtrated? ought to you have filtrated? ought to he have filtrated? ought to we have filtrated? ought to you have filtrated? ought to they have filtrated?
V-ing perfect
ought to I have been filtrating? ought to you have been filtrating? ought to he have been filtrating? ought to we have been filtrating? ought to you have been filtrating? ought to they have been filtrating?
Interro-negative form
Simple form
oughtn't I to filtrate? oughtn't you to filtrate? oughtn't he to filtrate? oughtn't we to filtrate? oughtn't you to filtrate? oughtn't they to filtrate?
V-ing form
oughtn't I to be filtrating? oughtn't you to be filtrating? oughtn't he to be filtrating? oughtn't we to be filtrating? oughtn't you to be filtrating? oughtn't they to be filtrating?
Perfect
oughtn't I to have filtrated? oughtn't you to have filtrated? oughtn't he to have filtrated? oughtn't we to have filtrated? oughtn't you to have filtrated? oughtn't they to have filtrated?
V-ing perfect
oughtn't I to have been filtrating? oughtn't you to have been filtrating? oughtn't he to have been filtrating? oughtn't we to have been filtrating? oughtn't you to have been filtrating? oughtn't they to have been filtrating?