I could caseate you could caseate she could caseate we could caseate you could caseate they could caseate
V-ing form
I could be caseating you could be caseating she could be caseating we could be caseating you could be caseating they could be caseating
Perfect
I could have caseated you could have caseated she 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 she could have been caseating we could have been caseating you could have been caseating they could have been caseating
Negation
Simple form
I couldn't caseate you couldn't caseate she couldn't caseate we couldn't caseate you couldn't caseate they couldn't caseate
V-ing form
I couldn't be caseating you couldn't be caseating she couldn't be caseating we couldn't be caseating you couldn't be caseating they couldn't be caseating
Perfect
I couldn't have caseated you couldn't have caseated she couldn't have caseated we couldn't have caseated you couldn't have caseated they couldn't have caseated
V-ing perfect
I couldn't have been caseating you couldn't have been caseating she couldn't have been caseating we couldn't have been caseating you couldn't have been caseating they couldn't have been caseating
Interrogative form
Simple form
could I caseate? could you caseate? could she caseate? could we caseate? could you caseate? could they caseate?
V-ing form
could I be caseating? could you be caseating? could she be caseating? could we be caseating? could you be caseating? could they be caseating?
Perfect
could I have caseated? could you have caseated? could she 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 she have been caseating? could we have been caseating? could you have been caseating? could they have been caseating?
Interro-negative form
Simple form
couldn't I caseate? couldn't you caseate? couldn't she caseate? couldn't we caseate? couldn't you caseate? couldn't they caseate?
V-ing form
couldn't I be caseating? couldn't you be caseating? couldn't she be caseating? couldn't we be caseating? couldn't you be caseating? couldn't they be caseating?
Perfect
couldn't I have caseated? couldn't you have caseated? couldn't she have caseated? couldn't we have caseated? couldn't you have caseated? couldn't they have caseated?
V-ing perfect
couldn't I have been caseating? couldn't you have been caseating? couldn't she have been caseating? couldn't we have been caseating? couldn't you have been caseating? couldn't they have been caseating?