I could federalize you could federalize he could federalize we could federalize you could federalize they could federalize
V-ing form
I could be federalizing you could be federalizing he could be federalizing we could be federalizing you could be federalizing they could be federalizing
Perfect
I could have federalized you could have federalized he 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 he 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 he 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 he 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 he 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 he 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 he federalize? could we federalize? could you federalize? could they federalize?
V-ing form
could I be federalizing? could you be federalizing? could he be federalizing? could we be federalizing? could you be federalizing? could they be federalizing?
Perfect
could I have federalized? could you have federalized? could he 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 he 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 he 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 he 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 he 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 he have been federalizing? couldn't we have been federalizing? couldn't you have been federalizing? couldn't they have been federalizing?