I could elucidate you could elucidate he could elucidate we could elucidate you could elucidate they could elucidate
V-ing form
I could be elucidating you could be elucidating he could be elucidating we could be elucidating you could be elucidating they could be elucidating
Perfect
I could have elucidated you could have elucidated he could have elucidated we could have elucidated you could have elucidated they could have elucidated
V-ing perfect
I could have been elucidating you could have been elucidating he could have been elucidating we could have been elucidating you could have been elucidating they could have been elucidating
Negation
Simple form
I could not elucidate you could not elucidate he could not elucidate we could not elucidate you could not elucidate they could not elucidate
V-ing form
I could not be elucidating you could not be elucidating he could not be elucidating we could not be elucidating you could not be elucidating they could not be elucidating
Perfect
I could not have elucidated you could not have elucidated he could not have elucidated we could not have elucidated you could not have elucidated they could not have elucidated
V-ing perfect
I could not have been elucidating you could not have been elucidating he could not have been elucidating we could not have been elucidating you could not have been elucidating they could not have been elucidating
Interrogative form
Simple form
could I elucidate? could you elucidate? could he elucidate? could we elucidate? could you elucidate? could they elucidate?
V-ing form
could I be elucidating? could you be elucidating? could he be elucidating? could we be elucidating? could you be elucidating? could they be elucidating?
Perfect
could I have elucidated? could you have elucidated? could he have elucidated? could we have elucidated? could you have elucidated? could they have elucidated?
V-ing perfect
could I have been elucidating? could you have been elucidating? could he have been elucidating? could we have been elucidating? could you have been elucidating? could they have been elucidating?
Interro-negative form
Simple form
could I not elucidate? could you not elucidate? could he not elucidate? could we not elucidate? could you not elucidate? could they not elucidate?
V-ing form
could I not be elucidating? could you not be elucidating? could he not be elucidating? could we not be elucidating? could you not be elucidating? could they not be elucidating?
Perfect
could I not have elucidated? could you not have elucidated? could he not have elucidated? could we not have elucidated? could you not have elucidated? could they not have elucidated?
V-ing perfect
could I not have been elucidating? could you not have been elucidating? could he not have been elucidating? could we not have been elucidating? could you not have been elucidating? could they not have been elucidating?