I could frolic you could frolic she could frolic we could frolic you could frolic they could frolic
V-ing form
I could be frolicing you could be frolicing she could be frolicing we could be frolicing you could be frolicing they could be frolicing
Perfect
I could have froliced you could have froliced she could have froliced we could have froliced you could have froliced they could have froliced
V-ing perfect
I could have been frolicing you could have been frolicing she could have been frolicing we could have been frolicing you could have been frolicing they could have been frolicing
Negation
Simple form
I could not frolic you could not frolic she could not frolic we could not frolic you could not frolic they could not frolic
V-ing form
I could not be frolicing you could not be frolicing she could not be frolicing we could not be frolicing you could not be frolicing they could not be frolicing
Perfect
I could not have froliced you could not have froliced she could not have froliced we could not have froliced you could not have froliced they could not have froliced
V-ing perfect
I could not have been frolicing you could not have been frolicing she could not have been frolicing we could not have been frolicing you could not have been frolicing they could not have been frolicing
Interrogative form
Simple form
could I frolic? could you frolic? could she frolic? could we frolic? could you frolic? could they frolic?
V-ing form
could I be frolicing? could you be frolicing? could she be frolicing? could we be frolicing? could you be frolicing? could they be frolicing?
Perfect
could I have froliced? could you have froliced? could she have froliced? could we have froliced? could you have froliced? could they have froliced?
V-ing perfect
could I have been frolicing? could you have been frolicing? could she have been frolicing? could we have been frolicing? could you have been frolicing? could they have been frolicing?
Interro-negative form
Simple form
could I not frolic? could you not frolic? could she not frolic? could we not frolic? could you not frolic? could they not frolic?
V-ing form
could I not be frolicing? could you not be frolicing? could she not be frolicing? could we not be frolicing? could you not be frolicing? could they not be frolicing?
Perfect
could I not have froliced? could you not have froliced? could she not have froliced? could we not have froliced? could you not have froliced? could they not have froliced?
V-ing perfect
could I not have been frolicing? could you not have been frolicing? could she not have been frolicing? could we not have been frolicing? could you not have been frolicing? could they not have been frolicing?