I can purple you can purple he can purple we can purple you can purple they can purple
V-ing form
I can be purpling you can be purpling he can be purpling we can be purpling you can be purpling they can be purpling
Perfect
I can have purpled you can have purpled he can have purpled we can have purpled you can have purpled they can have purpled
V-ing perfect
I can have been purpling you can have been purpling he can have been purpling we can have been purpling you can have been purpling they can have been purpling
Negation
Simple form
I cannot purple you cannot purple he cannot purple we cannot purple you cannot purple they cannot purple
V-ing form
I cannot be purpling you cannot be purpling he cannot be purpling we cannot be purpling you cannot be purpling they cannot be purpling
Perfect
I cannot have purpled you cannot have purpled he cannot have purpled we cannot have purpled you cannot have purpled they cannot have purpled
V-ing perfect
I cannot have been purpling you cannot have been purpling he cannot have been purpling we cannot have been purpling you cannot have been purpling they cannot have been purpling
Interrogative form
Simple form
can I purple? can you purple? can he purple? can we purple? can you purple? can they purple?
V-ing form
can I be purpling? can you be purpling? can he be purpling? can we be purpling? can you be purpling? can they be purpling?
Perfect
can I have purpled? can you have purpled? can he have purpled? can we have purpled? can you have purpled? can they have purpled?
V-ing perfect
can I have been purpling? can you have been purpling? can he have been purpling? can we have been purpling? can you have been purpling? can they have been purpling?
Interro-negative form
Simple form
can I not purple? can you not purple? can he not purple? can we not purple? can you not purple? can they not purple?
V-ing form
can I not be purpling? can you not be purpling? can he not be purpling? can we not be purpling? can you not be purpling? can they not be purpling?
Perfect
can I not have purpled? can you not have purpled? can he not have purpled? can we not have purpled? can you not have purpled? can they not have purpled?
V-ing perfect
can I not have been purpling? can you not have been purpling? can he not have been purpling? can we not have been purpling? can you not have been purpling? can they not have been purpling?