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