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