ought to preboard
Regular verb: preboard - preboarded- preboarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to preboard
you ought to preboard
he ought to preboard
we ought to preboard
you ought to preboard
they ought to preboard 	I ought to be preboarding
you ought to be preboarding
he ought to be preboarding
we ought to be preboarding
you ought to be preboarding
they ought to be preboarding	I ought to have preboarded
you ought to have preboarded
he ought to have preboarded
we ought to have preboarded
you ought to have preboarded
they ought to have preboarded	I ought to have been preboarding
you ought to have been preboarding
he ought to have been preboarding
we ought to have been preboarding
you ought to have been preboarding
they ought to have been preboarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to preboard
you oughtn't to preboard
he oughtn't to preboard
we oughtn't to preboard
you oughtn't to preboard
they oughtn't to preboard 	I oughtn't to be preboarding
you oughtn't to be preboarding
he oughtn't to be preboarding
we oughtn't to be preboarding
you oughtn't to be preboarding
they oughtn't to be preboarding	I oughtn't to have preboarded
you oughtn't to have preboarded
he oughtn't to have preboarded
we oughtn't to have preboarded
you oughtn't to have preboarded
they oughtn't to have preboarded	I oughtn't to have been preboarding
you oughtn't to have been preboarding
he oughtn't to have been preboarding
we oughtn't to have been preboarding
you oughtn't to have been preboarding
they oughtn't to have been preboarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I preboard?
ought to you preboard?
ought to he preboard?
ought to we preboard?
ought to you preboard?
ought to they preboard? 	ought to I be preboarding?
ought to you be preboarding?
ought to he be preboarding?
ought to we be preboarding?
ought to you be preboarding?
ought to they be preboarding? 	ought to I have preboarded?
ought to you have preboarded?
ought to he have preboarded?
ought to we have preboarded?
ought to you have preboarded?
ought to they have preboarded? 	ought to I have been preboarding?
ought to you have been preboarding?
ought to he have been preboarding?
ought to we have been preboarding?
ought to you have been preboarding?
ought to they have been preboarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to preboard?
oughtn't you to preboard?
oughtn't he to preboard?
oughtn't we to preboard?
oughtn't you to preboard?
oughtn't they to preboard? 	oughtn't I to be preboarding?
oughtn't you to be preboarding?
oughtn't he to be preboarding?
oughtn't we to be preboarding?
oughtn't you to be preboarding?
oughtn't they to be preboarding? 	oughtn't I to have preboarded?
oughtn't you to have preboarded?
oughtn't he to have preboarded?
oughtn't we to have preboarded?
oughtn't you to have preboarded?
oughtn't they to have preboarded? 	oughtn't I to have been preboarding?
oughtn't you to have been preboarding?
oughtn't he to have been preboarding?
oughtn't we to have been preboarding?
oughtn't you to have been preboarding?
oughtn't they to have been preboarding?