must petrify
Regular verb: petrify - petrified- petrified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must petrify
you must petrify
she must petrify
we must petrify
you must petrify
they must petrify 	I must be petrifying
you must be petrifying
she must be petrifying
we must be petrifying
you must be petrifying
they must be petrifying	I must have petrified
you must have petrified
she must have petrified
we must have petrified
you must have petrified
they must have petrified	I must have been petrifying
you must have been petrifying
she must have been petrifying
we must have been petrifying
you must have been petrifying
they must have been petrifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't petrify
you mustn't petrify
she mustn't petrify
we mustn't petrify
you mustn't petrify
they mustn't petrify 	I mustn't be petrifying
you mustn't be petrifying
she mustn't be petrifying
we mustn't be petrifying
you mustn't be petrifying
they mustn't be petrifying	I mustn't have petrified
you mustn't have petrified
she mustn't have petrified
we mustn't have petrified
you mustn't have petrified
they mustn't have petrified	I mustn't have been petrifying
you mustn't have been petrifying
she mustn't have been petrifying
we mustn't have been petrifying
you mustn't have been petrifying
they mustn't have been petrifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I petrify?
must you petrify?
must she petrify?
must we petrify?
must you petrify?
must they petrify? 	must I be petrifying?
must you be petrifying?
must she be petrifying?
must we be petrifying?
must you be petrifying?
must they be petrifying? 	must I have petrified?
must you have petrified?
must she have petrified?
must we have petrified?
must you have petrified?
must they have petrified? 	must I have been petrifying?
must you have been petrifying?
must she have been petrifying?
must we have been petrifying?
must you have been petrifying?
must they have been petrifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I petrify?
mustn't you petrify?
mustn't she petrify?
mustn't we petrify?
mustn't you petrify?
mustn't they petrify? 	mustn't I be petrifying?
mustn't you be petrifying?
mustn't she be petrifying?
mustn't we be petrifying?
mustn't you be petrifying?
mustn't they be petrifying? 	mustn't I have petrified?
mustn't you have petrified?
mustn't she have petrified?
mustn't we have petrified?
mustn't you have petrified?
mustn't they have petrified? 	mustn't I have been petrifying?
mustn't you have been petrifying?
mustn't she have been petrifying?
mustn't we have been petrifying?
mustn't you have been petrifying?
mustn't they have been petrifying?