English verb conjugation
MUST BOB

Regular verb: bob - bobbed - bobbed

Affirmation

Simple form	V-ing form
I must bob you must bob he must bob we must bob you must bob they must bob	I must be bobbing you must be bobbing he must be bobbing we must be bobbing you must be bobbing they must be bobbing
Perfect	V-ing perfect
I must have bobbed you must have bobbed he must have bobbed we must have bobbed you must have bobbed they must have bobbed	I must have been bobbing you must have been bobbing he must have been bobbing we must have been bobbing you must have been bobbing they must have been bobbing

Negation

Simple form	V-ing form
I mustn't bob you mustn't bob he mustn't bob we mustn't bob you mustn't bob they mustn't bob	I mustn't be bobbing you mustn't be bobbing he mustn't be bobbing we mustn't be bobbing you mustn't be bobbing they mustn't be bobbing
Perfect	V-ing perfect
I mustn't have bobbed you mustn't have bobbed he mustn't have bobbed we mustn't have bobbed you mustn't have bobbed they mustn't have bobbed	I mustn't have been bobbing you mustn't have been bobbing he mustn't have been bobbing we mustn't have been bobbing you mustn't have been bobbing they mustn't have been bobbing

Interrogative form

Simple form	V-ing form
must I bob? must you bob? must he bob? must we bob? must you bob? must they bob?	must I be bobbing? must you be bobbing? must he be bobbing? must we be bobbing? must you be bobbing? must they be bobbing?
Perfect	V-ing perfect
must I have bobbed? must you have bobbed? must he have bobbed? must we have bobbed? must you have bobbed? must they have bobbed?	must I have been bobbing? must you have been bobbing? must he have been bobbing? must we have been bobbing? must you have been bobbing? must they have been bobbing?

Interro-negative form

Simple form	V-ing form
mustn't I bob? mustn't you bob? mustn't he bob? mustn't we bob? mustn't you bob? mustn't they bob?	mustn't I be bobbing? mustn't you be bobbing? mustn't he be bobbing? mustn't we be bobbing? mustn't you be bobbing? mustn't they be bobbing?
Perfect	V-ing perfect
mustn't I have bobbed? mustn't you have bobbed? mustn't he have bobbed? mustn't we have bobbed? mustn't you have bobbed? mustn't they have bobbed?	mustn't I have been bobbing? mustn't you have been bobbing? mustn't he have been bobbing? mustn't we have been bobbing? mustn't you have been bobbing? mustn't they have been bobbing?