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