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 cannot hiss you cannot hiss he cannot hiss we cannot hiss you cannot hiss they cannot hiss	I cannot be hissing you cannot be hissing he cannot be hissing we cannot be hissing you cannot be hissing they cannot be hissing
Perfect	V-ing perfect
I cannot have hissed you cannot have hissed he cannot have hissed we cannot have hissed you cannot have hissed they cannot have hissed	I cannot have been hissing you cannot have been hissing he cannot have been hissing we cannot have been hissing you cannot have been hissing they cannot 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 I not hiss? can you not hiss? can he not hiss? can we not hiss? can you not hiss? can they not hiss?	can I not be hissing? can you not be hissing? can he not be hissing? can we not be hissing? can you not be hissing? can they not be hissing?
Perfect	V-ing perfect
can I not have hissed? can you not have hissed? can he not have hissed? can we not have hissed? can you not have hissed? can they not have hissed?	can I not have been hissing? can you not have been hissing? can he not have been hissing? can we not have been hissing? can you not have been hissing? can they not have been hissing?