I can gladden you can gladden he can gladden we can gladden you can gladden they can gladden
V-ing form
I can be gladdening you can be gladdening he can be gladdening we can be gladdening you can be gladdening they can be gladdening
Perfect
I can have gladdened you can have gladdened he can have gladdened we can have gladdened you can have gladdened they can have gladdened
V-ing perfect
I can have been gladdening you can have been gladdening he can have been gladdening we can have been gladdening you can have been gladdening they can have been gladdening
Negation
Simple form
I can't gladden you can't gladden he can't gladden we can't gladden you can't gladden they can't gladden
V-ing form
I can't be gladdening you can't be gladdening he can't be gladdening we can't be gladdening you can't be gladdening they can't be gladdening
Perfect
I can't have gladdened you can't have gladdened he can't have gladdened we can't have gladdened you can't have gladdened they can't have gladdened
V-ing perfect
I can't have been gladdening you can't have been gladdening he can't have been gladdening we can't have been gladdening you can't have been gladdening they can't have been gladdening
Interrogative form
Simple form
can I gladden? can you gladden? can he gladden? can we gladden? can you gladden? can they gladden?
V-ing form
can I be gladdening? can you be gladdening? can he be gladdening? can we be gladdening? can you be gladdening? can they be gladdening?
Perfect
can I have gladdened? can you have gladdened? can he have gladdened? can we have gladdened? can you have gladdened? can they have gladdened?
V-ing perfect
can I have been gladdening? can you have been gladdening? can he have been gladdening? can we have been gladdening? can you have been gladdening? can they have been gladdening?
Interro-negative form
Simple form
can't I gladden? can't you gladden? can't he gladden? can't we gladden? can't you gladden? can't they gladden?
V-ing form
can't I be gladdening? can't you be gladdening? can't he be gladdening? can't we be gladdening? can't you be gladdening? can't they be gladdening?
Perfect
can't I have gladdened? can't you have gladdened? can't he have gladdened? can't we have gladdened? can't you have gladdened? can't they have gladdened?
V-ing perfect
can't I have been gladdening? can't you have been gladdening? can't he have been gladdening? can't we have been gladdening? can't you have been gladdening? can't they have been gladdening?