English verb conjugation
MUST BUSY

Regular verb: busy - busied - busied

Affirmation

Simple form	V-ing form
I must busy you must busy she must busy we must busy you must busy they must busy	I must be busying you must be busying she must be busying we must be busying you must be busying they must be busying
Perfect	V-ing perfect
I must have busied you must have busied she must have busied we must have busied you must have busied they must have busied	I must have been busying you must have been busying she must have been busying we must have been busying you must have been busying they must have been busying

Negation

Simple form	V-ing form
I must not busy you must not busy she must not busy we must not busy you must not busy they must not busy	I must not be busying you must not be busying she must not be busying we must not be busying you must not be busying they must not be busying
Perfect	V-ing perfect
I must not have busied you must not have busied she must not have busied we must not have busied you must not have busied they must not have busied	I must not have been busying you must not have been busying she must not have been busying we must not have been busying you must not have been busying they must not have been busying

Interrogative form

Simple form	V-ing form
must I busy? must you busy? must she busy? must we busy? must you busy? must they busy?	must I be busying? must you be busying? must she be busying? must we be busying? must you be busying? must they be busying?
Perfect	V-ing perfect
must I have busied? must you have busied? must she have busied? must we have busied? must you have busied? must they have busied?	must I have been busying? must you have been busying? must she have been busying? must we have been busying? must you have been busying? must they have been busying?

Interro-negative form

Simple form	V-ing form
must I not busy? must you not busy? must she not busy? must we not busy? must you not busy? must they not busy?	must I not be busying? must you not be busying? must she not be busying? must we not be busying? must you not be busying? must they not be busying?
Perfect	V-ing perfect
must I not have busied? must you not have busied? must she not have busied? must we not have busied? must you not have busied? must they not have busied?	must I not have been busying? must you not have been busying? must she not have been busying? must we not have been busying? must you not have been busying? must they not have been busying?