English verb conjugation
CAN CASE

Regular verb: case - cased - cased

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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