must busy
Regular verb: busy - busied- busied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?