I could contract you could contract she could contract we could contract you could contract they could contract
V-ing form
I could be contracting you could be contracting she could be contracting we could be contracting you could be contracting they could be contracting
Perfect
I could have contracted you could have contracted she could have contracted we could have contracted you could have contracted they could have contracted
V-ing perfect
I could have been contracting you could have been contracting she could have been contracting we could have been contracting you could have been contracting they could have been contracting
Negation
Simple form
I couldn't contract you couldn't contract she couldn't contract we couldn't contract you couldn't contract they couldn't contract
V-ing form
I couldn't be contracting you couldn't be contracting she couldn't be contracting we couldn't be contracting you couldn't be contracting they couldn't be contracting
Perfect
I couldn't have contracted you couldn't have contracted she couldn't have contracted we couldn't have contracted you couldn't have contracted they couldn't have contracted
V-ing perfect
I couldn't have been contracting you couldn't have been contracting she couldn't have been contracting we couldn't have been contracting you couldn't have been contracting they couldn't have been contracting
Interrogative form
Simple form
could I contract? could you contract? could she contract? could we contract? could you contract? could they contract?
V-ing form
could I be contracting? could you be contracting? could she be contracting? could we be contracting? could you be contracting? could they be contracting?
Perfect
could I have contracted? could you have contracted? could she have contracted? could we have contracted? could you have contracted? could they have contracted?
V-ing perfect
could I have been contracting? could you have been contracting? could she have been contracting? could we have been contracting? could you have been contracting? could they have been contracting?
Interro-negative form
Simple form
couldn't I contract? couldn't you contract? couldn't she contract? couldn't we contract? couldn't you contract? couldn't they contract?
V-ing form
couldn't I be contracting? couldn't you be contracting? couldn't she be contracting? couldn't we be contracting? couldn't you be contracting? couldn't they be contracting?
Perfect
couldn't I have contracted? couldn't you have contracted? couldn't she have contracted? couldn't we have contracted? couldn't you have contracted? couldn't they have contracted?
V-ing perfect
couldn't I have been contracting? couldn't you have been contracting? couldn't she have been contracting? couldn't we have been contracting? couldn't you have been contracting? couldn't they have been contracting?