English verb conjugation
MAY HISS

Regular verb: hiss - hissed - hissed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?