English verb conjugation
OUGHT TO SIEVE

Regular verb: sieve - sieved - sieved

Affirmation

Simple form	V-ing form
I ought to sieve you ought to sieve he ought to sieve we ought to sieve you ought to sieve they ought to sieve	I ought to be sieving you ought to be sieving he ought to be sieving we ought to be sieving you ought to be sieving they ought to be sieving
Perfect	V-ing perfect
I ought to have sieved you ought to have sieved he ought to have sieved we ought to have sieved you ought to have sieved they ought to have sieved	I ought to have been sieving you ought to have been sieving he ought to have been sieving we ought to have been sieving you ought to have been sieving they ought to have been sieving

Negation

Simple form	V-ing form
I oughtn't to sieve you oughtn't to sieve he oughtn't to sieve we oughtn't to sieve you oughtn't to sieve they oughtn't to sieve	I oughtn't to be sieving you oughtn't to be sieving he oughtn't to be sieving we oughtn't to be sieving you oughtn't to be sieving they oughtn't to be sieving
Perfect	V-ing perfect
I oughtn't to have sieved you oughtn't to have sieved he oughtn't to have sieved we oughtn't to have sieved you oughtn't to have sieved they oughtn't to have sieved	I oughtn't to have been sieving you oughtn't to have been sieving he oughtn't to have been sieving we oughtn't to have been sieving you oughtn't to have been sieving they oughtn't to have been sieving

Interrogative form

Simple form	V-ing form
ought to I sieve? ought to you sieve? ought to he sieve? ought to we sieve? ought to you sieve? ought to they sieve?	ought to I be sieving? ought to you be sieving? ought to he be sieving? ought to we be sieving? ought to you be sieving? ought to they be sieving?
Perfect	V-ing perfect
ought to I have sieved? ought to you have sieved? ought to he have sieved? ought to we have sieved? ought to you have sieved? ought to they have sieved?	ought to I have been sieving? ought to you have been sieving? ought to he have been sieving? ought to we have been sieving? ought to you have been sieving? ought to they have been sieving?

Interro-negative form

Simple form	V-ing form
oughtn't I to sieve? oughtn't you to sieve? oughtn't he to sieve? oughtn't we to sieve? oughtn't you to sieve? oughtn't they to sieve?	oughtn't I to be sieving? oughtn't you to be sieving? oughtn't he to be sieving? oughtn't we to be sieving? oughtn't you to be sieving? oughtn't they to be sieving?
Perfect	V-ing perfect
oughtn't I to have sieved? oughtn't you to have sieved? oughtn't he to have sieved? oughtn't we to have sieved? oughtn't you to have sieved? oughtn't they to have sieved?	oughtn't I to have been sieving? oughtn't you to have been sieving? oughtn't he to have been sieving? oughtn't we to have been sieving? oughtn't you to have been sieving? oughtn't they to have been sieving?