English verb conjugation
MUST STUB

Regular verb: stub - stubbed - stubbed

Affirmation

Simple form	V-ing form
I must stub you must stub he must stub we must stub you must stub they must stub	I must be stubbing you must be stubbing he must be stubbing we must be stubbing you must be stubbing they must be stubbing
Perfect	V-ing perfect
I must have stubbed you must have stubbed he must have stubbed we must have stubbed you must have stubbed they must have stubbed	I must have been stubbing you must have been stubbing he must have been stubbing we must have been stubbing you must have been stubbing they must have been stubbing

Negation

Simple form	V-ing form
I must not stub you must not stub he must not stub we must not stub you must not stub they must not stub	I must not be stubbing you must not be stubbing he must not be stubbing we must not be stubbing you must not be stubbing they must not be stubbing
Perfect	V-ing perfect
I must not have stubbed you must not have stubbed he must not have stubbed we must not have stubbed you must not have stubbed they must not have stubbed	I must not have been stubbing you must not have been stubbing he must not have been stubbing we must not have been stubbing you must not have been stubbing they must not have been stubbing

Interrogative form

Simple form	V-ing form
must I stub? must you stub? must he stub? must we stub? must you stub? must they stub?	must I be stubbing? must you be stubbing? must he be stubbing? must we be stubbing? must you be stubbing? must they be stubbing?
Perfect	V-ing perfect
must I have stubbed? must you have stubbed? must he have stubbed? must we have stubbed? must you have stubbed? must they have stubbed?	must I have been stubbing? must you have been stubbing? must he have been stubbing? must we have been stubbing? must you have been stubbing? must they have been stubbing?

Interro-negative form

Simple form	V-ing form
must I not stub? must you not stub? must he not stub? must we not stub? must you not stub? must they not stub?	must I not be stubbing? must you not be stubbing? must he not be stubbing? must we not be stubbing? must you not be stubbing? must they not be stubbing?
Perfect	V-ing perfect
must I not have stubbed? must you not have stubbed? must he not have stubbed? must we not have stubbed? must you not have stubbed? must they not have stubbed?	must I not have been stubbing? must you not have been stubbing? must he not have been stubbing? must we not have been stubbing? must you not have been stubbing? must they not have been stubbing?