English verb conjugation
MUST BUSY

Regular verb: busy - busied - busied

Affirmation

Simple form	V-ing form
I must busy you must busy he must busy we must busy you must busy they must busy	I must be busying you must be busying he 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 he 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 he 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 mustn't busy you mustn't busy he mustn't busy we mustn't busy you mustn't busy they mustn't busy	I mustn't be busying you mustn't be busying he mustn't be busying we mustn't be busying you mustn't be busying they mustn't be busying
Perfect	V-ing perfect
I mustn't have busied you mustn't have busied he mustn't have busied we mustn't have busied you mustn't have busied they mustn't have busied	I mustn't have been busying you mustn't have been busying he mustn't have been busying we mustn't have been busying you mustn't have been busying they mustn't have been busying

Interrogative form

Simple form	V-ing form
must I busy? must you busy? must he busy? must we busy? must you busy? must they busy?	must I be busying? must you be busying? must he 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 he 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 he 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
mustn't I busy? mustn't you busy? mustn't he busy? mustn't we busy? mustn't you busy? mustn't they busy?	mustn't I be busying? mustn't you be busying? mustn't he be busying? mustn't we be busying? mustn't you be busying? mustn't they be busying?
Perfect	V-ing perfect
mustn't I have busied? mustn't you have busied? mustn't he have busied? mustn't we have busied? mustn't you have busied? mustn't they have busied?	mustn't I have been busying? mustn't you have been busying? mustn't he have been busying? mustn't we have been busying? mustn't you have been busying? mustn't they have been busying?