English verb conjugation
CAN HISS

Regular verb: hiss - hissed - hissed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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