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