I can stab you can stab she can stab we can stab you can stab they can stab
V-ing form
I can be stabbing you can be stabbing she can be stabbing we can be stabbing you can be stabbing they can be stabbing
Perfect
I can have stabbed you can have stabbed she 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 she 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 she cannot stab we cannot stab you cannot stab they cannot stab
V-ing form
I cannot be stabbing you cannot be stabbing she cannot be stabbing we cannot be stabbing you cannot be stabbing they cannot be stabbing
Perfect
I cannot have stabbed you cannot have stabbed she 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 she 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 she stab? can we stab? can you stab? can they stab?
V-ing form
can I be stabbing? can you be stabbing? can she be stabbing? can we be stabbing? can you be stabbing? can they be stabbing?
Perfect
can I have stabbed? can you have stabbed? can she 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 she 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 she 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 she 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 she 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 she not have been stabbing? can we not have been stabbing? can you not have been stabbing? can they not have been stabbing?