must prettify
Regular verb: prettify - prettified- prettified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prettify
you must prettify
he must prettify
we must prettify
you must prettify
they must prettify 	I must be prettifying
you must be prettifying
he must be prettifying
we must be prettifying
you must be prettifying
they must be prettifying	I must have prettified
you must have prettified
he must have prettified
we must have prettified
you must have prettified
they must have prettified	I must have been prettifying
you must have been prettifying
he must have been prettifying
we must have been prettifying
you must have been prettifying
they must have been prettifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't prettify
you mustn't prettify
he mustn't prettify
we mustn't prettify
you mustn't prettify
they mustn't prettify 	I mustn't be prettifying
you mustn't be prettifying
he mustn't be prettifying
we mustn't be prettifying
you mustn't be prettifying
they mustn't be prettifying	I mustn't have prettified
you mustn't have prettified
he mustn't have prettified
we mustn't have prettified
you mustn't have prettified
they mustn't have prettified	I mustn't have been prettifying
you mustn't have been prettifying
he mustn't have been prettifying
we mustn't have been prettifying
you mustn't have been prettifying
they mustn't have been prettifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prettify?
must you prettify?
must he prettify?
must we prettify?
must you prettify?
must they prettify? 	must I be prettifying?
must you be prettifying?
must he be prettifying?
must we be prettifying?
must you be prettifying?
must they be prettifying? 	must I have prettified?
must you have prettified?
must he have prettified?
must we have prettified?
must you have prettified?
must they have prettified? 	must I have been prettifying?
must you have been prettifying?
must he have been prettifying?
must we have been prettifying?
must you have been prettifying?
must they have been prettifying? 	

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