I could take you could take he could take we could take you could take they could take
V-ing form
I could be taking you could be taking he could be taking we could be taking you could be taking they could be taking
Perfect
I could have taken you could have taken he could have taken we could have taken you could have taken they could have taken
V-ing perfect
I could have been taking you could have been taking he could have been taking we could have been taking you could have been taking they could have been taking
Negation
Simple form
I could not take you could not take he could not take we could not take you could not take they could not take
V-ing form
I could not be taking you could not be taking he could not be taking we could not be taking you could not be taking they could not be taking
Perfect
I could not have taken you could not have taken he could not have taken we could not have taken you could not have taken they could not have taken
V-ing perfect
I could not have been taking you could not have been taking he could not have been taking we could not have been taking you could not have been taking they could not have been taking
Interrogative form
Simple form
could I take? could you take? could he take? could we take? could you take? could they take?
V-ing form
could I be taking? could you be taking? could he be taking? could we be taking? could you be taking? could they be taking?
Perfect
could I have taken? could you have taken? could he have taken? could we have taken? could you have taken? could they have taken?
V-ing perfect
could I have been taking? could you have been taking? could he have been taking? could we have been taking? could you have been taking? could they have been taking?
Interro-negative form
Simple form
could I not take? could you not take? could he not take? could we not take? could you not take? could they not take?
V-ing form
could I not be taking? could you not be taking? could he not be taking? could we not be taking? could you not be taking? could they not be taking?
Perfect
could I not have taken? could you not have taken? could he not have taken? could we not have taken? could you not have taken? could they not have taken?
V-ing perfect
could I not have been taking? could you not have been taking? could he not have been taking? could we not have been taking? could you not have been taking? could they not have been taking?