must cloister
Regular verb: cloister - cloistered- cloistered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cloister
you must cloister
he must cloister
we must cloister
you must cloister
they must cloister 	I must be cloistering
you must be cloistering
he must be cloistering
we must be cloistering
you must be cloistering
they must be cloistering	I must have cloistered
you must have cloistered
he must have cloistered
we must have cloistered
you must have cloistered
they must have cloistered	I must have been cloistering
you must have been cloistering
he must have been cloistering
we must have been cloistering
you must have been cloistering
they must have been cloistering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't cloister
you mustn't cloister
he mustn't cloister
we mustn't cloister
you mustn't cloister
they mustn't cloister 	I mustn't be cloistering
you mustn't be cloistering
he mustn't be cloistering
we mustn't be cloistering
you mustn't be cloistering
they mustn't be cloistering	I mustn't have cloistered
you mustn't have cloistered
he mustn't have cloistered
we mustn't have cloistered
you mustn't have cloistered
they mustn't have cloistered	I mustn't have been cloistering
you mustn't have been cloistering
he mustn't have been cloistering
we mustn't have been cloistering
you mustn't have been cloistering
they mustn't have been cloistering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cloister?
must you cloister?
must he cloister?
must we cloister?
must you cloister?
must they cloister? 	must I be cloistering?
must you be cloistering?
must he be cloistering?
must we be cloistering?
must you be cloistering?
must they be cloistering? 	must I have cloistered?
must you have cloistered?
must he have cloistered?
must we have cloistered?
must you have cloistered?
must they have cloistered? 	must I have been cloistering?
must you have been cloistering?
must he have been cloistering?
must we have been cloistering?
must you have been cloistering?
must they have been cloistering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I cloister?
mustn't you cloister?
mustn't he cloister?
mustn't we cloister?
mustn't you cloister?
mustn't they cloister? 	mustn't I be cloistering?
mustn't you be cloistering?
mustn't he be cloistering?
mustn't we be cloistering?
mustn't you be cloistering?
mustn't they be cloistering? 	mustn't I have cloistered?
mustn't you have cloistered?
mustn't he have cloistered?
mustn't we have cloistered?
mustn't you have cloistered?
mustn't they have cloistered? 	mustn't I have been cloistering?
mustn't you have been cloistering?
mustn't he have been cloistering?
mustn't we have been cloistering?
mustn't you have been cloistering?
mustn't they have been cloistering?