I could interlineate you could interlineate he could interlineate we could interlineate you could interlineate they could interlineate
V-ing form
I could be interlineating you could be interlineating he could be interlineating we could be interlineating you could be interlineating they could be interlineating
Perfect
I could have interlineated you could have interlineated he could have interlineated we could have interlineated you could have interlineated they could have interlineated
V-ing perfect
I could have been interlineating you could have been interlineating he could have been interlineating we could have been interlineating you could have been interlineating they could have been interlineating
Negation
Simple form
I could not interlineate you could not interlineate he could not interlineate we could not interlineate you could not interlineate they could not interlineate
V-ing form
I could not be interlineating you could not be interlineating he could not be interlineating we could not be interlineating you could not be interlineating they could not be interlineating
Perfect
I could not have interlineated you could not have interlineated he could not have interlineated we could not have interlineated you could not have interlineated they could not have interlineated
V-ing perfect
I could not have been interlineating you could not have been interlineating he could not have been interlineating we could not have been interlineating you could not have been interlineating they could not have been interlineating
Interrogative form
Simple form
could I interlineate? could you interlineate? could he interlineate? could we interlineate? could you interlineate? could they interlineate?
V-ing form
could I be interlineating? could you be interlineating? could he be interlineating? could we be interlineating? could you be interlineating? could they be interlineating?
Perfect
could I have interlineated? could you have interlineated? could he have interlineated? could we have interlineated? could you have interlineated? could they have interlineated?
V-ing perfect
could I have been interlineating? could you have been interlineating? could he have been interlineating? could we have been interlineating? could you have been interlineating? could they have been interlineating?
Interro-negative form
Simple form
could I not interlineate? could you not interlineate? could he not interlineate? could we not interlineate? could you not interlineate? could they not interlineate?
V-ing form
could I not be interlineating? could you not be interlineating? could he not be interlineating? could we not be interlineating? could you not be interlineating? could they not be interlineating?
Perfect
could I not have interlineated? could you not have interlineated? could he not have interlineated? could we not have interlineated? could you not have interlineated? could they not have interlineated?
V-ing perfect
could I not have been interlineating? could you not have been interlineating? could he not have been interlineating? could we not have been interlineating? could you not have been interlineating? could they not have been interlineating?