should preboard
Verbo regular: preboard - preboarded- preboarded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd preboard
you'd preboard
he'd preboard
we'd preboard
you'd preboard
they'd preboard 	I'd be preboarding
you'd be preboarding
he'd be preboarding
we'd be preboarding
you'd be preboarding
they'd be preboarding	I should've preboarded
you should've preboarded
he should've preboarded
we should've preboarded
you should've preboarded
they should've preboarded	I should've been preboarding
you should've been preboarding
he should've been preboarding
we should've been preboarding
you should've been preboarding
they should've been preboarding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't preboard
you shouldn't preboard
he shouldn't preboard
we shouldn't preboard
you shouldn't preboard
they shouldn't preboard 	I shouldn't be preboarding
you shouldn't be preboarding
he shouldn't be preboarding
we shouldn't be preboarding
you shouldn't be preboarding
they shouldn't be preboarding	I shouldn't have preboarded
you shouldn't have preboarded
he shouldn't have preboarded
we shouldn't have preboarded
you shouldn't have preboarded
they shouldn't have preboarded	I shouldn't have been preboarding
you shouldn't have been preboarding
he shouldn't have been preboarding
we shouldn't have been preboarding
you shouldn't have been preboarding
they shouldn't have been preboarding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I preboard?
should you preboard?
should he preboard?
should we preboard?
should you preboard?
should they preboard? 	should I be preboarding?
should you be preboarding?
should he be preboarding?
should we be preboarding?
should you be preboarding?
should they be preboarding? 	should I have preboarded?
should you have preboarded?
should he have preboarded?
should we have preboarded?
should you have preboarded?
should they have preboarded? 	should I have been preboarding?
should you have been preboarding?
should he have been preboarding?
should we have been preboarding?
should you have been preboarding?
should they have been preboarding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I preboard?
shouldn't you preboard?
shouldn't he preboard?
shouldn't we preboard?
shouldn't you preboard?
shouldn't they preboard? 	shouldn't I be preboarding?
shouldn't you be preboarding?
shouldn't he be preboarding?
shouldn't we be preboarding?
shouldn't you be preboarding?
shouldn't they be preboarding? 	shouldn't I have preboarded?
shouldn't you have preboarded?
shouldn't he have preboarded?
shouldn't we have preboarded?
shouldn't you have preboarded?
shouldn't they have preboarded? 	shouldn't I have been preboarding?
shouldn't you have been preboarding?
shouldn't he have been preboarding?
shouldn't we have been preboarding?
shouldn't you have been preboarding?
shouldn't they have been preboarding?