ought to preplan
Regular verb: preplan - preplaned- preplaned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to preplan
you ought to preplan
she ought to preplan
we ought to preplan
you ought to preplan
they ought to preplan 	I ought to be preplaning
you ought to be preplaning
she ought to be preplaning
we ought to be preplaning
you ought to be preplaning
they ought to be preplaning	I ought to have preplaned
you ought to have preplaned
she ought to have preplaned
we ought to have preplaned
you ought to have preplaned
they ought to have preplaned	I ought to have been preplaning
you ought to have been preplaning
she ought to have been preplaning
we ought to have been preplaning
you ought to have been preplaning
they ought to have been preplaning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to preplan
you oughtn't to preplan
she oughtn't to preplan
we oughtn't to preplan
you oughtn't to preplan
they oughtn't to preplan 	I oughtn't to be preplaning
you oughtn't to be preplaning
she oughtn't to be preplaning
we oughtn't to be preplaning
you oughtn't to be preplaning
they oughtn't to be preplaning	I oughtn't to have preplaned
you oughtn't to have preplaned
she oughtn't to have preplaned
we oughtn't to have preplaned
you oughtn't to have preplaned
they oughtn't to have preplaned	I oughtn't to have been preplaning
you oughtn't to have been preplaning
she oughtn't to have been preplaning
we oughtn't to have been preplaning
you oughtn't to have been preplaning
they oughtn't to have been preplaning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I preplan?
ought to you preplan?
ought to she preplan?
ought to we preplan?
ought to you preplan?
ought to they preplan? 	ought to I be preplaning?
ought to you be preplaning?
ought to she be preplaning?
ought to we be preplaning?
ought to you be preplaning?
ought to they be preplaning? 	ought to I have preplaned?
ought to you have preplaned?
ought to she have preplaned?
ought to we have preplaned?
ought to you have preplaned?
ought to they have preplaned? 	ought to I have been preplaning?
ought to you have been preplaning?
ought to she have been preplaning?
ought to we have been preplaning?
ought to you have been preplaning?
ought to they have been preplaning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to preplan?
oughtn't you to preplan?
oughtn't she to preplan?
oughtn't we to preplan?
oughtn't you to preplan?
oughtn't they to preplan? 	oughtn't I to be preplaning?
oughtn't you to be preplaning?
oughtn't she to be preplaning?
oughtn't we to be preplaning?
oughtn't you to be preplaning?
oughtn't they to be preplaning? 	oughtn't I to have preplaned?
oughtn't you to have preplaned?
oughtn't she to have preplaned?
oughtn't we to have preplaned?
oughtn't you to have preplaned?
oughtn't they to have preplaned? 	oughtn't I to have been preplaning?
oughtn't you to have been preplaning?
oughtn't she to have been preplaning?
oughtn't we to have been preplaning?
oughtn't you to have been preplaning?
oughtn't they to have been preplaning?