I can jest you can jest she can jest we can jest you can jest they can jest
V-ing form
I can be jesting you can be jesting she can be jesting we can be jesting you can be jesting they can be jesting
Perfect
I can have jested you can have jested she can have jested we can have jested you can have jested they can have jested
V-ing perfect
I can have been jesting you can have been jesting she can have been jesting we can have been jesting you can have been jesting they can have been jesting
Negation
Simple form
I can't jest you can't jest she can't jest we can't jest you can't jest they can't jest
V-ing form
I can't be jesting you can't be jesting she can't be jesting we can't be jesting you can't be jesting they can't be jesting
Perfect
I can't have jested you can't have jested she can't have jested we can't have jested you can't have jested they can't have jested
V-ing perfect
I can't have been jesting you can't have been jesting she can't have been jesting we can't have been jesting you can't have been jesting they can't have been jesting
Interrogative form
Simple form
can I jest? can you jest? can she jest? can we jest? can you jest? can they jest?
V-ing form
can I be jesting? can you be jesting? can she be jesting? can we be jesting? can you be jesting? can they be jesting?
Perfect
can I have jested? can you have jested? can she have jested? can we have jested? can you have jested? can they have jested?
V-ing perfect
can I have been jesting? can you have been jesting? can she have been jesting? can we have been jesting? can you have been jesting? can they have been jesting?
Interro-negative form
Simple form
can't I jest? can't you jest? can't she jest? can't we jest? can't you jest? can't they jest?
V-ing form
can't I be jesting? can't you be jesting? can't she be jesting? can't we be jesting? can't you be jesting? can't they be jesting?
Perfect
can't I have jested? can't you have jested? can't she have jested? can't we have jested? can't you have jested? can't they have jested?
V-ing perfect
can't I have been jesting? can't you have been jesting? can't she have been jesting? can't we have been jesting? can't you have been jesting? can't they have been jesting?