ought to preserve
Regular verb: preserve - preserved- preserved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to preserve
you ought to preserve
he ought to preserve
we ought to preserve
you ought to preserve
they ought to preserve 	I ought to be preserving
you ought to be preserving
he ought to be preserving
we ought to be preserving
you ought to be preserving
they ought to be preserving	I ought to have preserved
you ought to have preserved
he ought to have preserved
we ought to have preserved
you ought to have preserved
they ought to have preserved	I ought to have been preserving
you ought to have been preserving
he ought to have been preserving
we ought to have been preserving
you ought to have been preserving
they ought to have been preserving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to preserve
you oughtn't to preserve
he oughtn't to preserve
we oughtn't to preserve
you oughtn't to preserve
they oughtn't to preserve 	I oughtn't to be preserving
you oughtn't to be preserving
he oughtn't to be preserving
we oughtn't to be preserving
you oughtn't to be preserving
they oughtn't to be preserving	I oughtn't to have preserved
you oughtn't to have preserved
he oughtn't to have preserved
we oughtn't to have preserved
you oughtn't to have preserved
they oughtn't to have preserved	I oughtn't to have been preserving
you oughtn't to have been preserving
he oughtn't to have been preserving
we oughtn't to have been preserving
you oughtn't to have been preserving
they oughtn't to have been preserving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I preserve?
ought to you preserve?
ought to he preserve?
ought to we preserve?
ought to you preserve?
ought to they preserve? 	ought to I be preserving?
ought to you be preserving?
ought to he be preserving?
ought to we be preserving?
ought to you be preserving?
ought to they be preserving? 	ought to I have preserved?
ought to you have preserved?
ought to he have preserved?
ought to we have preserved?
ought to you have preserved?
ought to they have preserved? 	ought to I have been preserving?
ought to you have been preserving?
ought to he have been preserving?
ought to we have been preserving?
ought to you have been preserving?
ought to they have been preserving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to preserve?
oughtn't you to preserve?
oughtn't he to preserve?
oughtn't we to preserve?
oughtn't you to preserve?
oughtn't they to preserve? 	oughtn't I to be preserving?
oughtn't you to be preserving?
oughtn't he to be preserving?
oughtn't we to be preserving?
oughtn't you to be preserving?
oughtn't they to be preserving? 	oughtn't I to have preserved?
oughtn't you to have preserved?
oughtn't he to have preserved?
oughtn't we to have preserved?
oughtn't you to have preserved?
oughtn't they to have preserved? 	oughtn't I to have been preserving?
oughtn't you to have been preserving?
oughtn't he to have been preserving?
oughtn't we to have been preserving?
oughtn't you to have been preserving?
oughtn't they to have been preserving?