may preboard
Verbo regular: preboard - preboarded- preboarded

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

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

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

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