must burst
Irregular verb: burst - burst- burst

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must burst
you must burst
he must burst
we must burst
you must burst
they must burst 	I must be bursting
you must be bursting
he must be bursting
we must be bursting
you must be bursting
they must be bursting	I must have burst
you must have burst
he must have burst
we must have burst
you must have burst
they must have burst	I must have been bursting
you must have been bursting
he must have been bursting
we must have been bursting
you must have been bursting
they must have been bursting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't burst
you mustn't burst
he mustn't burst
we mustn't burst
you mustn't burst
they mustn't burst 	I mustn't be bursting
you mustn't be bursting
he mustn't be bursting
we mustn't be bursting
you mustn't be bursting
they mustn't be bursting	I mustn't have burst
you mustn't have burst
he mustn't have burst
we mustn't have burst
you mustn't have burst
they mustn't have burst	I mustn't have been bursting
you mustn't have been bursting
he mustn't have been bursting
we mustn't have been bursting
you mustn't have been bursting
they mustn't have been bursting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I burst?
must you burst?
must he burst?
must we burst?
must you burst?
must they burst? 	must I be bursting?
must you be bursting?
must he be bursting?
must we be bursting?
must you be bursting?
must they be bursting? 	must I have burst?
must you have burst?
must he have burst?
must we have burst?
must you have burst?
must they have burst? 	must I have been bursting?
must you have been bursting?
must he have been bursting?
must we have been bursting?
must you have been bursting?
must they have been bursting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I burst?
mustn't you burst?
mustn't he burst?
mustn't we burst?
mustn't you burst?
mustn't they burst? 	mustn't I be bursting?
mustn't you be bursting?
mustn't he be bursting?
mustn't we be bursting?
mustn't you be bursting?
mustn't they be bursting? 	mustn't I have burst?
mustn't you have burst?
mustn't he have burst?
mustn't we have burst?
mustn't you have burst?
mustn't they have burst? 	mustn't I have been bursting?
mustn't you have been bursting?
mustn't he have been bursting?
mustn't we have been bursting?
mustn't you have been bursting?
mustn't they have been bursting?