I can stab you can stab he can stab we can stab you can stab they can stab
V-ing form
I can be stabbing you can be stabbing he can be stabbing we can be stabbing you can be stabbing they can be stabbing
Perfect
I can have stabbed you can have stabbed he can have stabbed we can have stabbed you can have stabbed they can have stabbed
V-ing perfect
I can have been stabbing you can have been stabbing he can have been stabbing we can have been stabbing you can have been stabbing they can have been stabbing
Negation
Simple form
I cannot stab you cannot stab he cannot stab we cannot stab you cannot stab they cannot stab
V-ing form
I cannot be stabbing you cannot be stabbing he cannot be stabbing we cannot be stabbing you cannot be stabbing they cannot be stabbing
Perfect
I cannot have stabbed you cannot have stabbed he cannot have stabbed we cannot have stabbed you cannot have stabbed they cannot have stabbed
V-ing perfect
I cannot have been stabbing you cannot have been stabbing he cannot have been stabbing we cannot have been stabbing you cannot have been stabbing they cannot have been stabbing
Interrogative form
Simple form
can I stab? can you stab? can he stab? can we stab? can you stab? can they stab?
V-ing form
can I be stabbing? can you be stabbing? can he be stabbing? can we be stabbing? can you be stabbing? can they be stabbing?
Perfect
can I have stabbed? can you have stabbed? can he have stabbed? can we have stabbed? can you have stabbed? can they have stabbed?
V-ing perfect
can I have been stabbing? can you have been stabbing? can he have been stabbing? can we have been stabbing? can you have been stabbing? can they have been stabbing?
Interro-negative form
Simple form
can I not stab? can you not stab? can he not stab? can we not stab? can you not stab? can they not stab?
V-ing form
can I not be stabbing? can you not be stabbing? can he not be stabbing? can we not be stabbing? can you not be stabbing? can they not be stabbing?
Perfect
can I not have stabbed? can you not have stabbed? can he not have stabbed? can we not have stabbed? can you not have stabbed? can they not have stabbed?
V-ing perfect
can I not have been stabbing? can you not have been stabbing? can he not have been stabbing? can we not have been stabbing? can you not have been stabbing? can they not have been stabbing?