ought to filter
Verbo regular: filter - filtered- filtered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I ought to filter
you ought to filter
he ought to filter
we ought to filter
you ought to filter
they ought to filter 	I ought to be filtering
you ought to be filtering
he ought to be filtering
we ought to be filtering
you ought to be filtering
they ought to be filtering	I ought to have filtered
you ought to have filtered
he ought to have filtered
we ought to have filtered
you ought to have filtered
they ought to have filtered	I ought to have been filtering
you ought to have been filtering
he ought to have been filtering
we ought to have been filtering
you ought to have been filtering
they ought to have been filtering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I oughtn't to filter
you oughtn't to filter
he oughtn't to filter
we oughtn't to filter
you oughtn't to filter
they oughtn't to filter 	I oughtn't to be filtering
you oughtn't to be filtering
he oughtn't to be filtering
we oughtn't to be filtering
you oughtn't to be filtering
they oughtn't to be filtering	I oughtn't to have filtered
you oughtn't to have filtered
he oughtn't to have filtered
we oughtn't to have filtered
you oughtn't to have filtered
they oughtn't to have filtered	I oughtn't to have been filtering
you oughtn't to have been filtering
he oughtn't to have been filtering
we oughtn't to have been filtering
you oughtn't to have been filtering
they oughtn't to have been filtering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
ought to I filter?
ought to you filter?
ought to he filter?
ought to we filter?
ought to you filter?
ought to they filter? 	ought to I be filtering?
ought to you be filtering?
ought to he be filtering?
ought to we be filtering?
ought to you be filtering?
ought to they be filtering? 	ought to I have filtered?
ought to you have filtered?
ought to he have filtered?
ought to we have filtered?
ought to you have filtered?
ought to they have filtered? 	ought to I have been filtering?
ought to you have been filtering?
ought to he have been filtering?
ought to we have been filtering?
ought to you have been filtering?
ought to they have been filtering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
oughtn't I to filter?
oughtn't you to filter?
oughtn't he to filter?
oughtn't we to filter?
oughtn't you to filter?
oughtn't they to filter? 	oughtn't I to be filtering?
oughtn't you to be filtering?
oughtn't he to be filtering?
oughtn't we to be filtering?
oughtn't you to be filtering?
oughtn't they to be filtering? 	oughtn't I to have filtered?
oughtn't you to have filtered?
oughtn't he to have filtered?
oughtn't we to have filtered?
oughtn't you to have filtered?
oughtn't they to have filtered? 	oughtn't I to have been filtering?
oughtn't you to have been filtering?
oughtn't he to have been filtering?
oughtn't we to have been filtering?
oughtn't you to have been filtering?
oughtn't they to have been filtering?