must catalyze
Regular verb: catalyze - catalyzed- catalyzed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must catalyze
you must catalyze
he must catalyze
we must catalyze
you must catalyze
they must catalyze 	I must be catalyzing
you must be catalyzing
he must be catalyzing
we must be catalyzing
you must be catalyzing
they must be catalyzing	I must have catalyzed
you must have catalyzed
he must have catalyzed
we must have catalyzed
you must have catalyzed
they must have catalyzed	I must have been catalyzing
you must have been catalyzing
he must have been catalyzing
we must have been catalyzing
you must have been catalyzing
they must have been catalyzing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't catalyze
you mustn't catalyze
he mustn't catalyze
we mustn't catalyze
you mustn't catalyze
they mustn't catalyze 	I mustn't be catalyzing
you mustn't be catalyzing
he mustn't be catalyzing
we mustn't be catalyzing
you mustn't be catalyzing
they mustn't be catalyzing	I mustn't have catalyzed
you mustn't have catalyzed
he mustn't have catalyzed
we mustn't have catalyzed
you mustn't have catalyzed
they mustn't have catalyzed	I mustn't have been catalyzing
you mustn't have been catalyzing
he mustn't have been catalyzing
we mustn't have been catalyzing
you mustn't have been catalyzing
they mustn't have been catalyzing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I catalyze?
must you catalyze?
must he catalyze?
must we catalyze?
must you catalyze?
must they catalyze? 	must I be catalyzing?
must you be catalyzing?
must he be catalyzing?
must we be catalyzing?
must you be catalyzing?
must they be catalyzing? 	must I have catalyzed?
must you have catalyzed?
must he have catalyzed?
must we have catalyzed?
must you have catalyzed?
must they have catalyzed? 	must I have been catalyzing?
must you have been catalyzing?
must he have been catalyzing?
must we have been catalyzing?
must you have been catalyzing?
must they have been catalyzing? 	

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