English verb conjugation
MUST KRASS

Regular verb: krass - krassed - krassed

Affirmation

Simple form	V-ing form
I must krass you must krass she must krass we must krass you must krass they must krass	I must be krassing you must be krassing she must be krassing we must be krassing you must be krassing they must be krassing
Perfect	V-ing perfect
I must have krassed you must have krassed she must have krassed we must have krassed you must have krassed they must have krassed	I must have been krassing you must have been krassing she must have been krassing we must have been krassing you must have been krassing they must have been krassing

Negation

Simple form	V-ing form
I must not krass you must not krass she must not krass we must not krass you must not krass they must not krass	I must not be krassing you must not be krassing she must not be krassing we must not be krassing you must not be krassing they must not be krassing
Perfect	V-ing perfect
I must not have krassed you must not have krassed she must not have krassed we must not have krassed you must not have krassed they must not have krassed	I must not have been krassing you must not have been krassing she must not have been krassing we must not have been krassing you must not have been krassing they must not have been krassing

Interrogative form

Simple form	V-ing form
must I krass? must you krass? must she krass? must we krass? must you krass? must they krass?	must I be krassing? must you be krassing? must she be krassing? must we be krassing? must you be krassing? must they be krassing?
Perfect	V-ing perfect
must I have krassed? must you have krassed? must she have krassed? must we have krassed? must you have krassed? must they have krassed?	must I have been krassing? must you have been krassing? must she have been krassing? must we have been krassing? must you have been krassing? must they have been krassing?

Interro-negative form

Simple form	V-ing form
must I not krass? must you not krass? must she not krass? must we not krass? must you not krass? must they not krass?	must I not be krassing? must you not be krassing? must she not be krassing? must we not be krassing? must you not be krassing? must they not be krassing?
Perfect	V-ing perfect
must I not have krassed? must you not have krassed? must she not have krassed? must we not have krassed? must you not have krassed? must they not have krassed?	must I not have been krassing? must you not have been krassing? must she not have been krassing? must we not have been krassing? must you not have been krassing? must they not have been krassing?