English verb conjugation
MUST CATALYSE

Regular verb: catalyse - catalysed - catalysed

Affirmation

Simple form	V-ing form
I must catalyse you must catalyse he must catalyse we must catalyse you must catalyse they must catalyse	I must be catalysing you must be catalysing he must be catalysing we must be catalysing you must be catalysing they must be catalysing
Perfect	V-ing perfect
I must have catalysed you must have catalysed he must have catalysed we must have catalysed you must have catalysed they must have catalysed	I must have been catalysing you must have been catalysing he must have been catalysing we must have been catalysing you must have been catalysing they must have been catalysing

Negation

Simple form	V-ing form
I mustn't catalyse you mustn't catalyse he mustn't catalyse we mustn't catalyse you mustn't catalyse they mustn't catalyse	I mustn't be catalysing you mustn't be catalysing he mustn't be catalysing we mustn't be catalysing you mustn't be catalysing they mustn't be catalysing
Perfect	V-ing perfect
I mustn't have catalysed you mustn't have catalysed he mustn't have catalysed we mustn't have catalysed you mustn't have catalysed they mustn't have catalysed	I mustn't have been catalysing you mustn't have been catalysing he mustn't have been catalysing we mustn't have been catalysing you mustn't have been catalysing they mustn't have been catalysing

Interrogative form

Simple form	V-ing form
must I catalyse? must you catalyse? must he catalyse? must we catalyse? must you catalyse? must they catalyse?	must I be catalysing? must you be catalysing? must he be catalysing? must we be catalysing? must you be catalysing? must they be catalysing?
Perfect	V-ing perfect
must I have catalysed? must you have catalysed? must he have catalysed? must we have catalysed? must you have catalysed? must they have catalysed?	must I have been catalysing? must you have been catalysing? must he have been catalysing? must we have been catalysing? must you have been catalysing? must they have been catalysing?

Interro-negative form

Simple form	V-ing form
mustn't I catalyse? mustn't you catalyse? mustn't he catalyse? mustn't we catalyse? mustn't you catalyse? mustn't they catalyse?	mustn't I be catalysing? mustn't you be catalysing? mustn't he be catalysing? mustn't we be catalysing? mustn't you be catalysing? mustn't they be catalysing?
Perfect	V-ing perfect
mustn't I have catalysed? mustn't you have catalysed? mustn't he have catalysed? mustn't we have catalysed? mustn't you have catalysed? mustn't they have catalysed?	mustn't I have been catalysing? mustn't you have been catalysing? mustn't he have been catalysing? mustn't we have been catalysing? mustn't you have been catalysing? mustn't they have been catalysing?