I could pant you could pant she could pant we could pant you could pant they could pant
V-ing form
I could be panting you could be panting she could be panting we could be panting you could be panting they could be panting
Perfect
I could have panted you could have panted she could have panted we could have panted you could have panted they could have panted
V-ing perfect
I could have been panting you could have been panting she could have been panting we could have been panting you could have been panting they could have been panting
Negation
Simple form
I could not pant you could not pant she could not pant we could not pant you could not pant they could not pant
V-ing form
I could not be panting you could not be panting she could not be panting we could not be panting you could not be panting they could not be panting
Perfect
I could not have panted you could not have panted she could not have panted we could not have panted you could not have panted they could not have panted
V-ing perfect
I could not have been panting you could not have been panting she could not have been panting we could not have been panting you could not have been panting they could not have been panting
Interrogative form
Simple form
could I pant? could you pant? could she pant? could we pant? could you pant? could they pant?
V-ing form
could I be panting? could you be panting? could she be panting? could we be panting? could you be panting? could they be panting?
Perfect
could I have panted? could you have panted? could she have panted? could we have panted? could you have panted? could they have panted?
V-ing perfect
could I have been panting? could you have been panting? could she have been panting? could we have been panting? could you have been panting? could they have been panting?
Interro-negative form
Simple form
could I not pant? could you not pant? could she not pant? could we not pant? could you not pant? could they not pant?
V-ing form
could I not be panting? could you not be panting? could she not be panting? could we not be panting? could you not be panting? could they not be panting?
Perfect
could I not have panted? could you not have panted? could she not have panted? could we not have panted? could you not have panted? could they not have panted?
V-ing perfect
could I not have been panting? could you not have been panting? could she not have been panting? could we not have been panting? could you not have been panting? could they not have been panting?