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