English verb conjugation
MUST CLASS

Regular verb: class - classed - classed

Affirmation

Simple form	V-ing form
I must class you must class she must class we must class you must class they must class	I must be classing you must be classing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she class? must we class? must you class? must they class?	must I be classing? must you be classing? must she 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 she 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 she 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 she 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 she 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 she 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 she have been classing? mustn't we have been classing? mustn't you have been classing? mustn't they have been classing?