I can contract you can contract he can contract we can contract you can contract they can contract
V-ing form
I can be contracting you can be contracting he can be contracting we can be contracting you can be contracting they can be contracting
Perfect
I can have contracted you can have contracted he can have contracted we can have contracted you can have contracted they can have contracted
V-ing perfect
I can have been contracting you can have been contracting he can have been contracting we can have been contracting you can have been contracting they can have been contracting
Negation
Simple form
I cannot contract you cannot contract he cannot contract we cannot contract you cannot contract they cannot contract
V-ing form
I cannot be contracting you cannot be contracting he cannot be contracting we cannot be contracting you cannot be contracting they cannot be contracting
Perfect
I cannot have contracted you cannot have contracted he cannot have contracted we cannot have contracted you cannot have contracted they cannot have contracted
V-ing perfect
I cannot have been contracting you cannot have been contracting he cannot have been contracting we cannot have been contracting you cannot have been contracting they cannot have been contracting
Interrogative form
Simple form
can I contract? can you contract? can he contract? can we contract? can you contract? can they contract?
V-ing form
can I be contracting? can you be contracting? can he be contracting? can we be contracting? can you be contracting? can they be contracting?
Perfect
can I have contracted? can you have contracted? can he have contracted? can we have contracted? can you have contracted? can they have contracted?
V-ing perfect
can I have been contracting? can you have been contracting? can he have been contracting? can we have been contracting? can you have been contracting? can they have been contracting?
Interro-negative form
Simple form
can I not contract? can you not contract? can he not contract? can we not contract? can you not contract? can they not contract?
V-ing form
can I not be contracting? can you not be contracting? can he not be contracting? can we not be contracting? can you not be contracting? can they not be contracting?
Perfect
can I not have contracted? can you not have contracted? can he not have contracted? can we not have contracted? can you not have contracted? can they not have contracted?
V-ing perfect
can I not have been contracting? can you not have been contracting? can he not have been contracting? can we not have been contracting? can you not have been contracting? can they not have been contracting?