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