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 couldn't take you couldn't take he couldn't take we couldn't take you couldn't take they couldn't take
V-ing form
I couldn't be taking you couldn't be taking he couldn't be taking we couldn't be taking you couldn't be taking they couldn't be taking
Perfect
I couldn't have taken you couldn't have taken he couldn't have taken we couldn't have taken you couldn't have taken they couldn't have taken
V-ing perfect
I couldn't have been taking you couldn't have been taking he couldn't have been taking we couldn't have been taking you couldn't have been taking they couldn't 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
couldn't I take? couldn't you take? couldn't he take? couldn't we take? couldn't you take? couldn't they take?
V-ing form
couldn't I be taking? couldn't you be taking? couldn't he be taking? couldn't we be taking? couldn't you be taking? couldn't they be taking?
Perfect
couldn't I have taken? couldn't you have taken? couldn't he have taken? couldn't we have taken? couldn't you have taken? couldn't they have taken?
V-ing perfect
couldn't I have been taking? couldn't you have been taking? couldn't he have been taking? couldn't we have been taking? couldn't you have been taking? couldn't they have been taking?