could cloister
Regular verb: cloister - cloistered- cloistered

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

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

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

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