I can hiss you can hiss he can hiss we can hiss you can hiss they can hiss
V-ing form
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
I can have hissed you can have hissed he can have hissed we can have hissed you can have hissed they can have hissed
V-ing perfect
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
I cannot hiss you cannot hiss he cannot hiss we cannot hiss you cannot hiss they cannot hiss
V-ing form
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
I cannot have hissed you cannot have hissed he cannot have hissed we cannot have hissed you cannot have hissed they cannot have hissed
V-ing perfect
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
can I hiss? can you hiss? can he hiss? can we hiss? can you hiss? can they hiss?
V-ing form
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
can I have hissed? can you have hissed? can he have hissed? can we have hissed? can you have hissed? can they have hissed?
V-ing perfect
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
can I not hiss? can you not hiss? can he not hiss? can we not hiss? can you not hiss? can they not hiss?
V-ing form
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
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?
V-ing perfect
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?