I could caseate you could caseate he could caseate we could caseate you could caseate they could caseate
V-ing form
I could be caseating you could be caseating he could be caseating we could be caseating you could be caseating they could be caseating
Perfect
I could have caseated you could have caseated he could have caseated we could have caseated you could have caseated they could have caseated
V-ing perfect
I could have been caseating you could have been caseating he could have been caseating we could have been caseating you could have been caseating they could have been caseating
Negation
Simple form
I could not caseate you could not caseate he could not caseate we could not caseate you could not caseate they could not caseate
V-ing form
I could not be caseating you could not be caseating he could not be caseating we could not be caseating you could not be caseating they could not be caseating
Perfect
I could not have caseated you could not have caseated he could not have caseated we could not have caseated you could not have caseated they could not have caseated
V-ing perfect
I could not have been caseating you could not have been caseating he could not have been caseating we could not have been caseating you could not have been caseating they could not have been caseating
Interrogative form
Simple form
could I caseate? could you caseate? could he caseate? could we caseate? could you caseate? could they caseate?
V-ing form
could I be caseating? could you be caseating? could he be caseating? could we be caseating? could you be caseating? could they be caseating?
Perfect
could I have caseated? could you have caseated? could he have caseated? could we have caseated? could you have caseated? could they have caseated?
V-ing perfect
could I have been caseating? could you have been caseating? could he have been caseating? could we have been caseating? could you have been caseating? could they have been caseating?
Interro-negative form
Simple form
could I not caseate? could you not caseate? could he not caseate? could we not caseate? could you not caseate? could they not caseate?
V-ing form
could I not be caseating? could you not be caseating? could he not be caseating? could we not be caseating? could you not be caseating? could they not be caseating?
Perfect
could I not have caseated? could you not have caseated? could he not have caseated? could we not have caseated? could you not have caseated? could they not have caseated?
V-ing perfect
could I not have been caseating? could you not have been caseating? could he not have been caseating? could we not have been caseating? could you not have been caseating? could they not have been caseating?