I could sport you could sport she could sport we could sport you could sport they could sport
V-ing form
I could be sporting you could be sporting she could be sporting we could be sporting you could be sporting they could be sporting
Perfect
I could have sported you could have sported she could have sported we could have sported you could have sported they could have sported
V-ing perfect
I could have been sporting you could have been sporting she could have been sporting we could have been sporting you could have been sporting they could have been sporting
Negation
Simple form
I could not sport you could not sport she could not sport we could not sport you could not sport they could not sport
V-ing form
I could not be sporting you could not be sporting she could not be sporting we could not be sporting you could not be sporting they could not be sporting
Perfect
I could not have sported you could not have sported she could not have sported we could not have sported you could not have sported they could not have sported
V-ing perfect
I could not have been sporting you could not have been sporting she could not have been sporting we could not have been sporting you could not have been sporting they could not have been sporting
Interrogative form
Simple form
could I sport? could you sport? could she sport? could we sport? could you sport? could they sport?
V-ing form
could I be sporting? could you be sporting? could she be sporting? could we be sporting? could you be sporting? could they be sporting?
Perfect
could I have sported? could you have sported? could she have sported? could we have sported? could you have sported? could they have sported?
V-ing perfect
could I have been sporting? could you have been sporting? could she have been sporting? could we have been sporting? could you have been sporting? could they have been sporting?
Interro-negative form
Simple form
could I not sport? could you not sport? could she not sport? could we not sport? could you not sport? could they not sport?
V-ing form
could I not be sporting? could you not be sporting? could she not be sporting? could we not be sporting? could you not be sporting? could they not be sporting?
Perfect
could I not have sported? could you not have sported? could she not have sported? could we not have sported? could you not have sported? could they not have sported?
V-ing perfect
could I not have been sporting? could you not have been sporting? could she not have been sporting? could we not have been sporting? could you not have been sporting? could they not have been sporting?