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 couldn't pant you couldn't pant she couldn't pant we couldn't pant you couldn't pant they couldn't pant
V-ing form
I couldn't be panting you couldn't be panting she couldn't be panting we couldn't be panting you couldn't be panting they couldn't be panting
Perfect
I couldn't have panted you couldn't have panted she couldn't have panted we couldn't have panted you couldn't have panted they couldn't have panted
V-ing perfect
I couldn't have been panting you couldn't have been panting she couldn't have been panting we couldn't have been panting you couldn't have been panting they couldn't 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
couldn't I pant? couldn't you pant? couldn't she pant? couldn't we pant? couldn't you pant? couldn't they pant?
V-ing form
couldn't I be panting? couldn't you be panting? couldn't she be panting? couldn't we be panting? couldn't you be panting? couldn't they be panting?
Perfect
couldn't I have panted? couldn't you have panted? couldn't she have panted? couldn't we have panted? couldn't you have panted? couldn't they have panted?
V-ing perfect
couldn't I have been panting? couldn't you have been panting? couldn't she have been panting? couldn't we have been panting? couldn't you have been panting? couldn't they have been panting?