could roc
Regular verb: roc - roced- roced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could roc
you could roc
she could roc
we could roc
you could roc
they could roc 	I could be rocing
you could be rocing
she could be rocing
we could be rocing
you could be rocing
they could be rocing	I could have roced
you could have roced
she could have roced
we could have roced
you could have roced
they could have roced	I could have been rocing
you could have been rocing
she could have been rocing
we could have been rocing
you could have been rocing
they could have been rocing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't roc
you couldn't roc
she couldn't roc
we couldn't roc
you couldn't roc
they couldn't roc 	I couldn't be rocing
you couldn't be rocing
she couldn't be rocing
we couldn't be rocing
you couldn't be rocing
they couldn't be rocing	I couldn't have roced
you couldn't have roced
she couldn't have roced
we couldn't have roced
you couldn't have roced
they couldn't have roced	I couldn't have been rocing
you couldn't have been rocing
she couldn't have been rocing
we couldn't have been rocing
you couldn't have been rocing
they couldn't have been rocing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I roc?
could you roc?
could she roc?
could we roc?
could you roc?
could they roc? 	could I be rocing?
could you be rocing?
could she be rocing?
could we be rocing?
could you be rocing?
could they be rocing? 	could I have roced?
could you have roced?
could she have roced?
could we have roced?
could you have roced?
could they have roced? 	could I have been rocing?
could you have been rocing?
could she have been rocing?
could we have been rocing?
could you have been rocing?
could they have been rocing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I roc?
couldn't you roc?
couldn't she roc?
couldn't we roc?
couldn't you roc?
couldn't they roc? 	couldn't I be rocing?
couldn't you be rocing?
couldn't she be rocing?
couldn't we be rocing?
couldn't you be rocing?
couldn't they be rocing? 	couldn't I have roced?
couldn't you have roced?
couldn't she have roced?
couldn't we have roced?
couldn't you have roced?
couldn't they have roced? 	couldn't I have been rocing?
couldn't you have been rocing?
couldn't she have been rocing?
couldn't we have been rocing?
couldn't you have been rocing?
couldn't they have been rocing?