must fire
Regular verb: fire - fired- fired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fire
you must fire
he must fire
we must fire
you must fire
they must fire 	I must be firing
you must be firing
he must be firing
we must be firing
you must be firing
they must be firing	I must have fired
you must have fired
he must have fired
we must have fired
you must have fired
they must have fired	I must have been firing
you must have been firing
he must have been firing
we must have been firing
you must have been firing
they must have been firing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't fire
you mustn't fire
he mustn't fire
we mustn't fire
you mustn't fire
they mustn't fire 	I mustn't be firing
you mustn't be firing
he mustn't be firing
we mustn't be firing
you mustn't be firing
they mustn't be firing	I mustn't have fired
you mustn't have fired
he mustn't have fired
we mustn't have fired
you mustn't have fired
they mustn't have fired	I mustn't have been firing
you mustn't have been firing
he mustn't have been firing
we mustn't have been firing
you mustn't have been firing
they mustn't have been firing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fire?
must you fire?
must he fire?
must we fire?
must you fire?
must they fire? 	must I be firing?
must you be firing?
must he be firing?
must we be firing?
must you be firing?
must they be firing? 	must I have fired?
must you have fired?
must he have fired?
must we have fired?
must you have fired?
must they have fired? 	must I have been firing?
must you have been firing?
must he have been firing?
must we have been firing?
must you have been firing?
must they have been firing? 	

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