may preboard
Regular verb: preboard - preboarded- preboarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may preboard
you may preboard
she may preboard
we may preboard
you may preboard
they may preboard 	I may be preboarding
you may be preboarding
she may be preboarding
we may be preboarding
you may be preboarding
they may be preboarding	I may have preboarded
you may have preboarded
she 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
she may have been preboarding
we may have been preboarding
you may have been preboarding
they may have been preboarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't preboard
you mayn't preboard
she 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
she 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
she 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
she mayn't have been preboarding
we mayn't have been preboarding
you mayn't have been preboarding
they mayn't have been preboarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I preboard?
may you preboard?
may she preboard?
may we preboard?
may you preboard?
may they preboard? 	may I be preboarding?
may you be preboarding?
may she be preboarding?
may we be preboarding?
may you be preboarding?
may they be preboarding? 	may I have preboarded?
may you have preboarded?
may she 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 she have been preboarding?
may we have been preboarding?
may you have been preboarding?
may they have been preboarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I preboard?
mayn't you preboard?
mayn't she 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 she 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 she 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 she have been preboarding?
mayn't we have been preboarding?
mayn't you have been preboarding?
mayn't they have been preboarding?