must prong
Regular verb: prong - pronged- pronged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prong
you must prong
she must prong
we must prong
you must prong
they must prong 	I must be pronging
you must be pronging
she must be pronging
we must be pronging
you must be pronging
they must be pronging	I must have pronged
you must have pronged
she must have pronged
we must have pronged
you must have pronged
they must have pronged	I must have been pronging
you must have been pronging
she must have been pronging
we must have been pronging
you must have been pronging
they must have been pronging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't prong
you mustn't prong
she mustn't prong
we mustn't prong
you mustn't prong
they mustn't prong 	I mustn't be pronging
you mustn't be pronging
she mustn't be pronging
we mustn't be pronging
you mustn't be pronging
they mustn't be pronging	I mustn't have pronged
you mustn't have pronged
she mustn't have pronged
we mustn't have pronged
you mustn't have pronged
they mustn't have pronged	I mustn't have been pronging
you mustn't have been pronging
she mustn't have been pronging
we mustn't have been pronging
you mustn't have been pronging
they mustn't have been pronging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prong?
must you prong?
must she prong?
must we prong?
must you prong?
must they prong? 	must I be pronging?
must you be pronging?
must she be pronging?
must we be pronging?
must you be pronging?
must they be pronging? 	must I have pronged?
must you have pronged?
must she have pronged?
must we have pronged?
must you have pronged?
must they have pronged? 	must I have been pronging?
must you have been pronging?
must she have been pronging?
must we have been pronging?
must you have been pronging?
must they have been pronging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I prong?
mustn't you prong?
mustn't she prong?
mustn't we prong?
mustn't you prong?
mustn't they prong? 	mustn't I be pronging?
mustn't you be pronging?
mustn't she be pronging?
mustn't we be pronging?
mustn't you be pronging?
mustn't they be pronging? 	mustn't I have pronged?
mustn't you have pronged?
mustn't she have pronged?
mustn't we have pronged?
mustn't you have pronged?
mustn't they have pronged? 	mustn't I have been pronging?
mustn't you have been pronging?
mustn't she have been pronging?
mustn't we have been pronging?
mustn't you have been pronging?
mustn't they have been pronging?