I could administe you could administe he could administe we could administe you could administe they could administe
V-ing form
I could be administing you could be administing he could be administing we could be administing you could be administing they could be administing
Perfect
I could have administed you could have administed he could have administed we could have administed you could have administed they could have administed
V-ing perfect
I could have been administing you could have been administing he could have been administing we could have been administing you could have been administing they could have been administing
Negation
Simple form
I couldn't administe you couldn't administe he couldn't administe we couldn't administe you couldn't administe they couldn't administe
V-ing form
I couldn't be administing you couldn't be administing he couldn't be administing we couldn't be administing you couldn't be administing they couldn't be administing
Perfect
I couldn't have administed you couldn't have administed he couldn't have administed we couldn't have administed you couldn't have administed they couldn't have administed
V-ing perfect
I couldn't have been administing you couldn't have been administing he couldn't have been administing we couldn't have been administing you couldn't have been administing they couldn't have been administing
Interrogative form
Simple form
could I administe? could you administe? could he administe? could we administe? could you administe? could they administe?
V-ing form
could I be administing? could you be administing? could he be administing? could we be administing? could you be administing? could they be administing?
Perfect
could I have administed? could you have administed? could he have administed? could we have administed? could you have administed? could they have administed?
V-ing perfect
could I have been administing? could you have been administing? could he have been administing? could we have been administing? could you have been administing? could they have been administing?
Interro-negative form
Simple form
couldn't I administe? couldn't you administe? couldn't he administe? couldn't we administe? couldn't you administe? couldn't they administe?
V-ing form
couldn't I be administing? couldn't you be administing? couldn't he be administing? couldn't we be administing? couldn't you be administing? couldn't they be administing?
Perfect
couldn't I have administed? couldn't you have administed? couldn't he have administed? couldn't we have administed? couldn't you have administed? couldn't they have administed?
V-ing perfect
couldn't I have been administing? couldn't you have been administing? couldn't he have been administing? couldn't we have been administing? couldn't you have been administing? couldn't they have been administing?