I could elevate you could elevate he could elevate we could elevate you could elevate they could elevate
V-ing form
I could be elevating you could be elevating he could be elevating we could be elevating you could be elevating they could be elevating
Perfect
I could have elevated you could have elevated he could have elevated we could have elevated you could have elevated they could have elevated
V-ing perfect
I could have been elevating you could have been elevating he could have been elevating we could have been elevating you could have been elevating they could have been elevating
Negation
Simple form
I could not elevate you could not elevate he could not elevate we could not elevate you could not elevate they could not elevate
V-ing form
I could not be elevating you could not be elevating he could not be elevating we could not be elevating you could not be elevating they could not be elevating
Perfect
I could not have elevated you could not have elevated he could not have elevated we could not have elevated you could not have elevated they could not have elevated
V-ing perfect
I could not have been elevating you could not have been elevating he could not have been elevating we could not have been elevating you could not have been elevating they could not have been elevating
Interrogative form
Simple form
could I elevate? could you elevate? could he elevate? could we elevate? could you elevate? could they elevate?
V-ing form
could I be elevating? could you be elevating? could he be elevating? could we be elevating? could you be elevating? could they be elevating?
Perfect
could I have elevated? could you have elevated? could he have elevated? could we have elevated? could you have elevated? could they have elevated?
V-ing perfect
could I have been elevating? could you have been elevating? could he have been elevating? could we have been elevating? could you have been elevating? could they have been elevating?
Interro-negative form
Simple form
could I not elevate? could you not elevate? could he not elevate? could we not elevate? could you not elevate? could they not elevate?
V-ing form
could I not be elevating? could you not be elevating? could he not be elevating? could we not be elevating? could you not be elevating? could they not be elevating?
Perfect
could I not have elevated? could you not have elevated? could he not have elevated? could we not have elevated? could you not have elevated? could they not have elevated?
V-ing perfect
could I not have been elevating? could you not have been elevating? could he not have been elevating? could we not have been elevating? could you not have been elevating? could they not have been elevating?