I could illuminate you could illuminate she could illuminate we could illuminate you could illuminate they could illuminate
V-ing form
I could be illuminating you could be illuminating she could be illuminating we could be illuminating you could be illuminating they could be illuminating
Perfect
I could have illuminated you could have illuminated she could have illuminated we could have illuminated you could have illuminated they could have illuminated
V-ing perfect
I could have been illuminating you could have been illuminating she could have been illuminating we could have been illuminating you could have been illuminating they could have been illuminating
Negation
Simple form
I could not illuminate you could not illuminate she could not illuminate we could not illuminate you could not illuminate they could not illuminate
V-ing form
I could not be illuminating you could not be illuminating she could not be illuminating we could not be illuminating you could not be illuminating they could not be illuminating
Perfect
I could not have illuminated you could not have illuminated she could not have illuminated we could not have illuminated you could not have illuminated they could not have illuminated
V-ing perfect
I could not have been illuminating you could not have been illuminating she could not have been illuminating we could not have been illuminating you could not have been illuminating they could not have been illuminating
Interrogative form
Simple form
could I illuminate? could you illuminate? could she illuminate? could we illuminate? could you illuminate? could they illuminate?
V-ing form
could I be illuminating? could you be illuminating? could she be illuminating? could we be illuminating? could you be illuminating? could they be illuminating?
Perfect
could I have illuminated? could you have illuminated? could she have illuminated? could we have illuminated? could you have illuminated? could they have illuminated?
V-ing perfect
could I have been illuminating? could you have been illuminating? could she have been illuminating? could we have been illuminating? could you have been illuminating? could they have been illuminating?
Interro-negative form
Simple form
could I not illuminate? could you not illuminate? could she not illuminate? could we not illuminate? could you not illuminate? could they not illuminate?
V-ing form
could I not be illuminating? could you not be illuminating? could she not be illuminating? could we not be illuminating? could you not be illuminating? could they not be illuminating?
Perfect
could I not have illuminated? could you not have illuminated? could she not have illuminated? could we not have illuminated? could you not have illuminated? could they not have illuminated?
V-ing perfect
could I not have been illuminating? could you not have been illuminating? could she not have been illuminating? could we not have been illuminating? could you not have been illuminating? could they not have been illuminating?