ought to sieve
Regular verb: sieve - sieved- sieved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?