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 mustn't stub you mustn't stub he mustn't stub we mustn't stub you mustn't stub they mustn't stub	I mustn't be stubbing you mustn't be stubbing he mustn't be stubbing we mustn't be stubbing you mustn't be stubbing they mustn't be stubbing
Perfect	V-ing perfect
I mustn't have stubbed you mustn't have stubbed he mustn't have stubbed we mustn't have stubbed you mustn't have stubbed they mustn't have stubbed	I mustn't have been stubbing you mustn't have been stubbing he mustn't have been stubbing we mustn't have been stubbing you mustn't have been stubbing they mustn't 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
mustn't I stub? mustn't you stub? mustn't he stub? mustn't we stub? mustn't you stub? mustn't they stub?	mustn't I be stubbing? mustn't you be stubbing? mustn't he be stubbing? mustn't we be stubbing? mustn't you be stubbing? mustn't they be stubbing?
Perfect	V-ing perfect
mustn't I have stubbed? mustn't you have stubbed? mustn't he have stubbed? mustn't we have stubbed? mustn't you have stubbed? mustn't they have stubbed?	mustn't I have been stubbing? mustn't you have been stubbing? mustn't he have been stubbing? mustn't we have been stubbing? mustn't you have been stubbing? mustn't they have been stubbing?