can preboard
Verbo regular: preboard - preboarded- preboarded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can preboard
you can preboard
he can preboard
we can preboard
you can preboard
they can preboard 	I can be preboarding
you can be preboarding
he can be preboarding
we can be preboarding
you can be preboarding
they can be preboarding	I can have preboarded
you can have preboarded
he can have preboarded
we can have preboarded
you can have preboarded
they can have preboarded	I can have been preboarding
you can have been preboarding
he can have been preboarding
we can have been preboarding
you can have been preboarding
they can have been preboarding	

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

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

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