English verb conjugation
MUST CRAM

Regular verb: cram - crammed - crammed

Affirmation

Simple form	V-ing form
I must cram you must cram she must cram we must cram you must cram they must cram	I must be cramming you must be cramming she must be cramming we must be cramming you must be cramming they must be cramming
Perfect	V-ing perfect
I must have crammed you must have crammed she must have crammed we must have crammed you must have crammed they must have crammed	I must have been cramming you must have been cramming she must have been cramming we must have been cramming you must have been cramming they must have been cramming

Negation

Simple form	V-ing form
I mustn't cram you mustn't cram she mustn't cram we mustn't cram you mustn't cram they mustn't cram	I mustn't be cramming you mustn't be cramming she mustn't be cramming we mustn't be cramming you mustn't be cramming they mustn't be cramming
Perfect	V-ing perfect
I mustn't have crammed you mustn't have crammed she mustn't have crammed we mustn't have crammed you mustn't have crammed they mustn't have crammed	I mustn't have been cramming you mustn't have been cramming she mustn't have been cramming we mustn't have been cramming you mustn't have been cramming they mustn't have been cramming

Interrogative form

Simple form	V-ing form
must I cram? must you cram? must she cram? must we cram? must you cram? must they cram?	must I be cramming? must you be cramming? must she be cramming? must we be cramming? must you be cramming? must they be cramming?
Perfect	V-ing perfect
must I have crammed? must you have crammed? must she have crammed? must we have crammed? must you have crammed? must they have crammed?	must I have been cramming? must you have been cramming? must she have been cramming? must we have been cramming? must you have been cramming? must they have been cramming?

Interro-negative form

Simple form	V-ing form
mustn't I cram? mustn't you cram? mustn't she cram? mustn't we cram? mustn't you cram? mustn't they cram?	mustn't I be cramming? mustn't you be cramming? mustn't she be cramming? mustn't we be cramming? mustn't you be cramming? mustn't they be cramming?
Perfect	V-ing perfect
mustn't I have crammed? mustn't you have crammed? mustn't she have crammed? mustn't we have crammed? mustn't you have crammed? mustn't they have crammed?	mustn't I have been cramming? mustn't you have been cramming? mustn't she have been cramming? mustn't we have been cramming? mustn't you have been cramming? mustn't they have been cramming?