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