I could rescue you could rescue he could rescue we could rescue you could rescue they could rescue
V-ing form
I could be rescuing you could be rescuing he could be rescuing we could be rescuing you could be rescuing they could be rescuing
Perfect
I could have rescued you could have rescued he could have rescued we could have rescued you could have rescued they could have rescued
V-ing perfect
I could have been rescuing you could have been rescuing he could have been rescuing we could have been rescuing you could have been rescuing they could have been rescuing
Negation
Simple form
I could not rescue you could not rescue he could not rescue we could not rescue you could not rescue they could not rescue
V-ing form
I could not be rescuing you could not be rescuing he could not be rescuing we could not be rescuing you could not be rescuing they could not be rescuing
Perfect
I could not have rescued you could not have rescued he could not have rescued we could not have rescued you could not have rescued they could not have rescued
V-ing perfect
I could not have been rescuing you could not have been rescuing he could not have been rescuing we could not have been rescuing you could not have been rescuing they could not have been rescuing
Interrogative form
Simple form
could I rescue? could you rescue? could he rescue? could we rescue? could you rescue? could they rescue?
V-ing form
could I be rescuing? could you be rescuing? could he be rescuing? could we be rescuing? could you be rescuing? could they be rescuing?
Perfect
could I have rescued? could you have rescued? could he have rescued? could we have rescued? could you have rescued? could they have rescued?
V-ing perfect
could I have been rescuing? could you have been rescuing? could he have been rescuing? could we have been rescuing? could you have been rescuing? could they have been rescuing?
Interro-negative form
Simple form
could I not rescue? could you not rescue? could he not rescue? could we not rescue? could you not rescue? could they not rescue?
V-ing form
could I not be rescuing? could you not be rescuing? could he not be rescuing? could we not be rescuing? could you not be rescuing? could they not be rescuing?
Perfect
could I not have rescued? could you not have rescued? could he not have rescued? could we not have rescued? could you not have rescued? could they not have rescued?
V-ing perfect
could I not have been rescuing? could you not have been rescuing? could he not have been rescuing? could we not have been rescuing? could you not have been rescuing? could they not have been rescuing?