English verb conjugation
MUST CLASS

Regular verb: class - classed - classed

Affirmation

Simple form	V-ing form
I must class you must class he must class we must class you must class they must class	I must be classing you must be classing he must be classing we must be classing you must be classing they must be classing
Perfect	V-ing perfect
I must have classed you must have classed he must have classed we must have classed you must have classed they must have classed	I must have been classing you must have been classing he must have been classing we must have been classing you must have been classing they must have been classing

Negation

Simple form	V-ing form
I mustn't class you mustn't class he mustn't class we mustn't class you mustn't class they mustn't class	I mustn't be classing you mustn't be classing he mustn't be classing we mustn't be classing you mustn't be classing they mustn't be classing
Perfect	V-ing perfect
I mustn't have classed you mustn't have classed he mustn't have classed we mustn't have classed you mustn't have classed they mustn't have classed	I mustn't have been classing you mustn't have been classing he mustn't have been classing we mustn't have been classing you mustn't have been classing they mustn't have been classing

Interrogative form

Simple form	V-ing form
must I class? must you class? must he class? must we class? must you class? must they class?	must I be classing? must you be classing? must he be classing? must we be classing? must you be classing? must they be classing?
Perfect	V-ing perfect
must I have classed? must you have classed? must he have classed? must we have classed? must you have classed? must they have classed?	must I have been classing? must you have been classing? must he have been classing? must we have been classing? must you have been classing? must they have been classing?

Interro-negative form

Simple form	V-ing form
mustn't I class? mustn't you class? mustn't he class? mustn't we class? mustn't you class? mustn't they class?	mustn't I be classing? mustn't you be classing? mustn't he be classing? mustn't we be classing? mustn't you be classing? mustn't they be classing?
Perfect	V-ing perfect
mustn't I have classed? mustn't you have classed? mustn't he have classed? mustn't we have classed? mustn't you have classed? mustn't they have classed?	mustn't I have been classing? mustn't you have been classing? mustn't he have been classing? mustn't we have been classing? mustn't you have been classing? mustn't they have been classing?