I must snub you must snub he must snub we must snub you must snub they must snub
V-ing form
I must be snubbing you must be snubbing he must be snubbing we must be snubbing you must be snubbing they must be snubbing
Perfect
I must have snubbed you must have snubbed he must have snubbed we must have snubbed you must have snubbed they must have snubbed
V-ing perfect
I must have been snubbing you must have been snubbing he must have been snubbing we must have been snubbing you must have been snubbing they must have been snubbing
Negation
Simple form
I must not snub you must not snub he must not snub we must not snub you must not snub they must not snub
V-ing form
I must not be snubbing you must not be snubbing he must not be snubbing we must not be snubbing you must not be snubbing they must not be snubbing
Perfect
I must not have snubbed you must not have snubbed he must not have snubbed we must not have snubbed you must not have snubbed they must not have snubbed
V-ing perfect
I must not have been snubbing you must not have been snubbing he must not have been snubbing we must not have been snubbing you must not have been snubbing they must not have been snubbing
Interrogative form
Simple form
must I snub? must you snub? must he snub? must we snub? must you snub? must they snub?
V-ing form
must I be snubbing? must you be snubbing? must he be snubbing? must we be snubbing? must you be snubbing? must they be snubbing?
Perfect
must I have snubbed? must you have snubbed? must he have snubbed? must we have snubbed? must you have snubbed? must they have snubbed?
V-ing perfect
must I have been snubbing? must you have been snubbing? must he have been snubbing? must we have been snubbing? must you have been snubbing? must they have been snubbing?
Interro-negative form
Simple form
must I not snub? must you not snub? must he not snub? must we not snub? must you not snub? must they not snub?
V-ing form
must I not be snubbing? must you not be snubbing? must he not be snubbing? must we not be snubbing? must you not be snubbing? must they not be snubbing?
Perfect
must I not have snubbed? must you not have snubbed? must he not have snubbed? must we not have snubbed? must you not have snubbed? must they not have snubbed?
V-ing perfect
must I not have been snubbing? must you not have been snubbing? must he not have been snubbing? must we not have been snubbing? must you not have been snubbing? must they not have been snubbing?