English verb conjugation
COULD CASE

Regular verb: case - cased - cased

Affirmation

Simple form	V-ing form
I could case you could case she could case we could case you could case they could case	I could be casing you could be casing she could be casing we could be casing you could be casing they could be casing
Perfect	V-ing perfect
I could have cased you could have cased she could have cased we could have cased you could have cased they could have cased	I could have been casing you could have been casing she could have been casing we could have been casing you could have been casing they could have been casing

Negation

Simple form	V-ing form
I couldn't case you couldn't case she couldn't case we couldn't case you couldn't case they couldn't case	I couldn't be casing you couldn't be casing she couldn't be casing we couldn't be casing you couldn't be casing they couldn't be casing
Perfect	V-ing perfect
I couldn't have cased you couldn't have cased she couldn't have cased we couldn't have cased you couldn't have cased they couldn't have cased	I couldn't have been casing you couldn't have been casing she couldn't have been casing we couldn't have been casing you couldn't have been casing they couldn't have been casing

Interrogative form

Simple form	V-ing form
could I case? could you case? could she case? could we case? could you case? could they case?	could I be casing? could you be casing? could she be casing? could we be casing? could you be casing? could they be casing?
Perfect	V-ing perfect
could I have cased? could you have cased? could she have cased? could we have cased? could you have cased? could they have cased?	could I have been casing? could you have been casing? could she have been casing? could we have been casing? could you have been casing? could they have been casing?

Interro-negative form

Simple form	V-ing form
couldn't I case? couldn't you case? couldn't she case? couldn't we case? couldn't you case? couldn't they case?	couldn't I be casing? couldn't you be casing? couldn't she be casing? couldn't we be casing? couldn't you be casing? couldn't they be casing?
Perfect	V-ing perfect
couldn't I have cased? couldn't you have cased? couldn't she have cased? couldn't we have cased? couldn't you have cased? couldn't they have cased?	couldn't I have been casing? couldn't you have been casing? couldn't she have been casing? couldn't we have been casing? couldn't you have been casing? couldn't they have been casing?