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