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 can't contract you can't contract he can't contract we can't contract you can't contract they can't contract
V-ing form
I can't be contracting you can't be contracting he can't be contracting we can't be contracting you can't be contracting they can't be contracting
Perfect
I can't have contracted you can't have contracted he can't have contracted we can't have contracted you can't have contracted they can't have contracted
V-ing perfect
I can't have been contracting you can't have been contracting he can't have been contracting we can't have been contracting you can't have been contracting they can't 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't I contract? can't you contract? can't he contract? can't we contract? can't you contract? can't they contract?
V-ing form
can't I be contracting? can't you be contracting? can't he be contracting? can't we be contracting? can't you be contracting? can't they be contracting?
Perfect
can't I have contracted? can't you have contracted? can't he have contracted? can't we have contracted? can't you have contracted? can't they have contracted?
V-ing perfect
can't I have been contracting? can't you have been contracting? can't he have been contracting? can't we have been contracting? can't you have been contracting? can't they have been contracting?