must greaten
Regular verb: greaten - greatened- greatened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must greaten
you must greaten
he must greaten
we must greaten
you must greaten
they must greaten 	I must be greatening
you must be greatening
he must be greatening
we must be greatening
you must be greatening
they must be greatening	I must have greatened
you must have greatened
he must have greatened
we must have greatened
you must have greatened
they must have greatened	I must have been greatening
you must have been greatening
he must have been greatening
we must have been greatening
you must have been greatening
they must have been greatening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't greaten
you mustn't greaten
he mustn't greaten
we mustn't greaten
you mustn't greaten
they mustn't greaten 	I mustn't be greatening
you mustn't be greatening
he mustn't be greatening
we mustn't be greatening
you mustn't be greatening
they mustn't be greatening	I mustn't have greatened
you mustn't have greatened
he mustn't have greatened
we mustn't have greatened
you mustn't have greatened
they mustn't have greatened	I mustn't have been greatening
you mustn't have been greatening
he mustn't have been greatening
we mustn't have been greatening
you mustn't have been greatening
they mustn't have been greatening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I greaten?
must you greaten?
must he greaten?
must we greaten?
must you greaten?
must they greaten? 	must I be greatening?
must you be greatening?
must he be greatening?
must we be greatening?
must you be greatening?
must they be greatening? 	must I have greatened?
must you have greatened?
must he have greatened?
must we have greatened?
must you have greatened?
must they have greatened? 	must I have been greatening?
must you have been greatening?
must he have been greatening?
must we have been greatening?
must you have been greatening?
must they have been greatening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I greaten?
mustn't you greaten?
mustn't he greaten?
mustn't we greaten?
mustn't you greaten?
mustn't they greaten? 	mustn't I be greatening?
mustn't you be greatening?
mustn't he be greatening?
mustn't we be greatening?
mustn't you be greatening?
mustn't they be greatening? 	mustn't I have greatened?
mustn't you have greatened?
mustn't he have greatened?
mustn't we have greatened?
mustn't you have greatened?
mustn't they have greatened? 	mustn't I have been greatening?
mustn't you have been greatening?
mustn't he have been greatening?
mustn't we have been greatening?
mustn't you have been greatening?
mustn't they have been greatening?