I may hiss you may hiss she may hiss we may hiss you may hiss they may hiss
V-ing form
I may be hissing you may be hissing she may be hissing we may be hissing you may be hissing they may be hissing
Perfect
I may have hissed you may have hissed she may have hissed we may have hissed you may have hissed they may have hissed
V-ing perfect
I may have been hissing you may have been hissing she may have been hissing we may have been hissing you may have been hissing they may have been hissing
Negation
Simple form
I may not hiss you may not hiss she may not hiss we may not hiss you may not hiss they may not hiss
V-ing form
I may not be hissing you may not be hissing she may not be hissing we may not be hissing you may not be hissing they may not be hissing
Perfect
I may not have hissed you may not have hissed she may not have hissed we may not have hissed you may not have hissed they may not have hissed
V-ing perfect
I may not have been hissing you may not have been hissing she may not have been hissing we may not have been hissing you may not have been hissing they may not have been hissing
Interrogative form
Simple form
may I hiss? may you hiss? may she hiss? may we hiss? may you hiss? may they hiss?
V-ing form
may I be hissing? may you be hissing? may she be hissing? may we be hissing? may you be hissing? may they be hissing?
Perfect
may I have hissed? may you have hissed? may she have hissed? may we have hissed? may you have hissed? may they have hissed?
V-ing perfect
may I have been hissing? may you have been hissing? may she have been hissing? may we have been hissing? may you have been hissing? may they have been hissing?
Interro-negative form
Simple form
may I not hiss? may you not hiss? may she not hiss? may we not hiss? may you not hiss? may they not hiss?
V-ing form
may I not be hissing? may you not be hissing? may she not be hissing? may we not be hissing? may you not be hissing? may they not be hissing?
Perfect
may I not have hissed? may you not have hissed? may she not have hissed? may we not have hissed? may you not have hissed? may they not have hissed?
V-ing perfect
may I not have been hissing? may you not have been hissing? may she not have been hissing? may we not have been hissing? may you not have been hissing? may they not have been hissing?