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 could not purple you could not purple he could not purple we could not purple you could not purple they could not purple
V-ing form
I could not be purpling you could not be purpling he could not be purpling we could not be purpling you could not be purpling they could not be purpling
Perfect
I could not have purpled you could not have purpled he could not have purpled we could not have purpled you could not have purpled they could not have purpled
V-ing perfect
I could not have been purpling you could not have been purpling he could not have been purpling we could not have been purpling you could not have been purpling they could not 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
could I not purple? could you not purple? could he not purple? could we not purple? could you not purple? could they not purple?
V-ing form
could I not be purpling? could you not be purpling? could he not be purpling? could we not be purpling? could you not be purpling? could they not be purpling?
Perfect
could I not have purpled? could you not have purpled? could he not have purpled? could we not have purpled? could you not have purpled? could they not have purpled?
V-ing perfect
could I not have been purpling? could you not have been purpling? could he not have been purpling? could we not have been purpling? could you not have been purpling? could they not have been purpling?