English verb conjugation
COULD ROC

Regular verb: roc - roced - roced

Affirmation

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