ought to prefer
Regular verb: prefer - preferred- preferred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to prefer
you ought to prefer
she ought to prefer
we ought to prefer
you ought to prefer
they ought to prefer 	I ought to be preferring
you ought to be preferring
she ought to be preferring
we ought to be preferring
you ought to be preferring
they ought to be preferring	I ought to have preferred
you ought to have preferred
she ought to have preferred
we ought to have preferred
you ought to have preferred
they ought to have preferred	I ought to have been preferring
you ought to have been preferring
she ought to have been preferring
we ought to have been preferring
you ought to have been preferring
they ought to have been preferring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to prefer
you ought not to prefer
she ought not to prefer
we ought not to prefer
you ought not to prefer
they ought not to prefer 	I ought not to preferring
you ought not to preferring
she ought not to preferring
we ought not to preferring
you ought not to preferring
they ought not to preferring	I ought not to have preferred
you ought not to have preferred
she ought not to have preferred
we ought not to have preferred
you ought not to have preferred
they ought not to have preferred	I ought not to have been preferring
you ought not to have been preferring
she ought not to have been preferring
we ought not to have been preferring
you ought not to have been preferring
they ought not to have been preferring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I prefer?
ought to you prefer?
ought to she prefer?
ought to we prefer?
ought to you prefer?
ought to they prefer? 	ought to I be preferring?
ought to you be preferring?
ought to she be preferring?
ought to we be preferring?
ought to you be preferring?
ought to they be preferring? 	ought to I have preferred?
ought to you have preferred?
ought to she have preferred?
ought to we have preferred?
ought to you have preferred?
ought to they have preferred? 	ought to I have been preferring?
ought to you have been preferring?
ought to she have been preferring?
ought to we have been preferring?
ought to you have been preferring?
ought to they have been preferring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to prefer?
ought you not to prefer?
ought she not to prefer?
ought we not to prefer?
ought you not to prefer?
ought they not to prefer? 	ought I not to be preferring?
ought you not to be preferring?
ought she not to be preferring?
ought we not to be preferring?
ought you not to be preferring?
ought they not to be preferring? 	ought I not to have preferred?
ought you not to have preferred?
ought she not to have preferred?
ought we not to have preferred?
ought you not to have preferred?
ought they not to have preferred? 	ought I not to have been preferring?
ought you not to have been preferring?
ought she not to have been preferring?
ought we not to have been preferring?
ought you not to have been preferring?
ought they not to have been preferring?