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 couldn't illuminate you couldn't illuminate she couldn't illuminate we couldn't illuminate you couldn't illuminate they couldn't illuminate
V-ing form
I couldn't be illuminating you couldn't be illuminating she couldn't be illuminating we couldn't be illuminating you couldn't be illuminating they couldn't be illuminating
Perfect
I couldn't have illuminated you couldn't have illuminated she couldn't have illuminated we couldn't have illuminated you couldn't have illuminated they couldn't have illuminated
V-ing perfect
I couldn't have been illuminating you couldn't have been illuminating she couldn't have been illuminating we couldn't have been illuminating you couldn't have been illuminating they couldn't 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
couldn't I illuminate? couldn't you illuminate? couldn't she illuminate? couldn't we illuminate? couldn't you illuminate? couldn't they illuminate?
V-ing form
couldn't I be illuminating? couldn't you be illuminating? couldn't she be illuminating? couldn't we be illuminating? couldn't you be illuminating? couldn't they be illuminating?
Perfect
couldn't I have illuminated? couldn't you have illuminated? couldn't she have illuminated? couldn't we have illuminated? couldn't you have illuminated? couldn't they have illuminated?
V-ing perfect
couldn't I have been illuminating? couldn't you have been illuminating? couldn't she have been illuminating? couldn't we have been illuminating? couldn't you have been illuminating? couldn't they have been illuminating?