may fast-forward
Regular verb: fast-forward - fast-forwarded- fast-forwarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may fast-forward
you may fast-forward
she may fast-forward
we may fast-forward
you may fast-forward
they may fast-forward 	I may be fast-forwarding
you may be fast-forwarding
she may be fast-forwarding
we may be fast-forwarding
you may be fast-forwarding
they may be fast-forwarding	I may have fast-forwarded
you may have fast-forwarded
she may have fast-forwarded
we may have fast-forwarded
you may have fast-forwarded
they may have fast-forwarded	I may have been fast-forwarding
you may have been fast-forwarding
she may have been fast-forwarding
we may have been fast-forwarding
you may have been fast-forwarding
they may have been fast-forwarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't fast-forward
you mayn't fast-forward
she mayn't fast-forward
we mayn't fast-forward
you mayn't fast-forward
they mayn't fast-forward 	I mayn't be fast-forwarding
you mayn't be fast-forwarding
she mayn't be fast-forwarding
we mayn't be fast-forwarding
you mayn't be fast-forwarding
they mayn't be fast-forwarding	I mayn't have fast-forwarded
you mayn't have fast-forwarded
she mayn't have fast-forwarded
we mayn't have fast-forwarded
you mayn't have fast-forwarded
they mayn't have fast-forwarded	I mayn't have been fast-forwarding
you mayn't have been fast-forwarding
she mayn't have been fast-forwarding
we mayn't have been fast-forwarding
you mayn't have been fast-forwarding
they mayn't have been fast-forwarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I fast-forward?
may you fast-forward?
may she fast-forward?
may we fast-forward?
may you fast-forward?
may they fast-forward? 	may I be fast-forwarding?
may you be fast-forwarding?
may she be fast-forwarding?
may we be fast-forwarding?
may you be fast-forwarding?
may they be fast-forwarding? 	may I have fast-forwarded?
may you have fast-forwarded?
may she have fast-forwarded?
may we have fast-forwarded?
may you have fast-forwarded?
may they have fast-forwarded? 	may I have been fast-forwarding?
may you have been fast-forwarding?
may she have been fast-forwarding?
may we have been fast-forwarding?
may you have been fast-forwarding?
may they have been fast-forwarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I fast-forward?
mayn't you fast-forward?
mayn't she fast-forward?
mayn't we fast-forward?
mayn't you fast-forward?
mayn't they fast-forward? 	mayn't I be fast-forwarding?
mayn't you be fast-forwarding?
mayn't she be fast-forwarding?
mayn't we be fast-forwarding?
mayn't you be fast-forwarding?
mayn't they be fast-forwarding? 	mayn't I have fast-forwarded?
mayn't you have fast-forwarded?
mayn't she have fast-forwarded?
mayn't we have fast-forwarded?
mayn't you have fast-forwarded?
mayn't they have fast-forwarded? 	mayn't I have been fast-forwarding?
mayn't you have been fast-forwarding?
mayn't she have been fast-forwarding?
mayn't we have been fast-forwarding?
mayn't you have been fast-forwarding?
mayn't they have been fast-forwarding?