could preboard
Verbe régulier : preboard - preboarded- preboarded

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could preboard
you could preboard
he could preboard
we could preboard
you could preboard
they could preboard 	I could be preboarding
you could be preboarding
he could be preboarding
we could be preboarding
you could be preboarding
they could be preboarding	I could have preboarded
you could have preboarded
he could have preboarded
we could have preboarded
you could have preboarded
they could have preboarded	I could have been preboarding
you could have been preboarding
he could have been preboarding
we could have been preboarding
you could have been preboarding
they could have been preboarding	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not preboard
you could not preboard
he could not preboard
we could not preboard
you could not preboard
they could not preboard 	I could not be preboarding
you could not be preboarding
he could not be preboarding
we could not be preboarding
you could not be preboarding
they could not be preboarding	I could not have preboarded
you could not have preboarded
he could not have preboarded
we could not have preboarded
you could not have preboarded
they could not have preboarded	I could not have been preboarding
you could not have been preboarding
he could not have been preboarding
we could not have been preboarding
you could not have been preboarding
they could not have been preboarding	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I preboard?
could you preboard?
could he preboard?
could we preboard?
could you preboard?
could they preboard? 	could I be preboarding?
could you be preboarding?
could he be preboarding?
could we be preboarding?
could you be preboarding?
could they be preboarding? 	could I have preboarded?
could you have preboarded?
could he have preboarded?
could we have preboarded?
could you have preboarded?
could they have preboarded? 	could I have been preboarding?
could you have been preboarding?
could he have been preboarding?
could we have been preboarding?
could you have been preboarding?
could they have been preboarding? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not preboard?
could you not preboard?
could he not preboard?
could we not preboard?
could you not preboard?
could they not preboard? 	could I not be preboarding?
could you not be preboarding?
could he not be preboarding?
could we not be preboarding?
could you not be preboarding?
could they not be preboarding? 	could I not have preboarded?
could you not have preboarded?
could he not have preboarded?
could we not have preboarded?
could you not have preboarded?
could they not have preboarded? 	could I not have been preboarding?
could you not have been preboarding?
could he not have been preboarding?
could we not have been preboarding?
could you not have been preboarding?
could they not have been preboarding?