I could restrain you could restrain she could restrain we could restrain you could restrain they could restrain
V-ing form
I could be restraining you could be restraining she could be restraining we could be restraining you could be restraining they could be restraining
Perfect
I could have restrained you could have restrained she could have restrained we could have restrained you could have restrained they could have restrained
V-ing perfect
I could have been restraining you could have been restraining she could have been restraining we could have been restraining you could have been restraining they could have been restraining
Negation
Simple form
I could not restrain you could not restrain she could not restrain we could not restrain you could not restrain they could not restrain
V-ing form
I could not be restraining you could not be restraining she could not be restraining we could not be restraining you could not be restraining they could not be restraining
Perfect
I could not have restrained you could not have restrained she could not have restrained we could not have restrained you could not have restrained they could not have restrained
V-ing perfect
I could not have been restraining you could not have been restraining she could not have been restraining we could not have been restraining you could not have been restraining they could not have been restraining
Interrogative form
Simple form
could I restrain? could you restrain? could she restrain? could we restrain? could you restrain? could they restrain?
V-ing form
could I be restraining? could you be restraining? could she be restraining? could we be restraining? could you be restraining? could they be restraining?
Perfect
could I have restrained? could you have restrained? could she have restrained? could we have restrained? could you have restrained? could they have restrained?
V-ing perfect
could I have been restraining? could you have been restraining? could she have been restraining? could we have been restraining? could you have been restraining? could they have been restraining?
Interro-negative form
Simple form
could I not restrain? could you not restrain? could she not restrain? could we not restrain? could you not restrain? could they not restrain?
V-ing form
could I not be restraining? could you not be restraining? could she not be restraining? could we not be restraining? could you not be restraining? could they not be restraining?
Perfect
could I not have restrained? could you not have restrained? could she not have restrained? could we not have restrained? could you not have restrained? could they not have restrained?
V-ing perfect
could I not have been restraining? could you not have been restraining? could she not have been restraining? could we not have been restraining? could you not have been restraining? could they not have been restraining?