may hiss
Regular verb: hiss - hissed- hissed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may hiss
you may hiss
he may hiss
we may hiss
you may hiss
they may hiss 	I may be hissing
you may be hissing
he may be hissing
we may be hissing
you may be hissing
they may be hissing	I may have hissed
you may have hissed
he may have hissed
we may have hissed
you may have hissed
they may have hissed	I may have been hissing
you may have been hissing
he may have been hissing
we may have been hissing
you may have been hissing
they may have been hissing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't hiss
you mayn't hiss
he mayn't hiss
we mayn't hiss
you mayn't hiss
they mayn't hiss 	I mayn't be hissing
you mayn't be hissing
he mayn't be hissing
we mayn't be hissing
you mayn't be hissing
they mayn't be hissing	I mayn't have hissed
you mayn't have hissed
he mayn't have hissed
we mayn't have hissed
you mayn't have hissed
they mayn't have hissed	I mayn't have been hissing
you mayn't have been hissing
he mayn't have been hissing
we mayn't have been hissing
you mayn't have been hissing
they mayn't have been hissing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I hiss?
may you hiss?
may he hiss?
may we hiss?
may you hiss?
may they hiss? 	may I be hissing?
may you be hissing?
may he be hissing?
may we be hissing?
may you be hissing?
may they be hissing? 	may I have hissed?
may you have hissed?
may he have hissed?
may we have hissed?
may you have hissed?
may they have hissed? 	may I have been hissing?
may you have been hissing?
may he have been hissing?
may we have been hissing?
may you have been hissing?
may they have been hissing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I hiss?
mayn't you hiss?
mayn't he hiss?
mayn't we hiss?
mayn't you hiss?
mayn't they hiss? 	mayn't I be hissing?
mayn't you be hissing?
mayn't he be hissing?
mayn't we be hissing?
mayn't you be hissing?
mayn't they be hissing? 	mayn't I have hissed?
mayn't you have hissed?
mayn't he have hissed?
mayn't we have hissed?
mayn't you have hissed?
mayn't they have hissed? 	mayn't I have been hissing?
mayn't you have been hissing?
mayn't he have been hissing?
mayn't we have been hissing?
mayn't you have been hissing?
mayn't they have been hissing?