I can gladden you can gladden she can gladden we can gladden you can gladden they can gladden
V-ing form
I can be gladdening you can be gladdening she can be gladdening we can be gladdening you can be gladdening they can be gladdening
Perfect
I can have gladdened you can have gladdened she 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 she can have been gladdening we can have been gladdening you can have been gladdening they can have been gladdening
Negation
Simple form
I cannot gladden you cannot gladden she cannot gladden we cannot gladden you cannot gladden they cannot gladden
V-ing form
I cannot be gladdening you cannot be gladdening she cannot be gladdening we cannot be gladdening you cannot be gladdening they cannot be gladdening
Perfect
I cannot have gladdened you cannot have gladdened she cannot have gladdened we cannot have gladdened you cannot have gladdened they cannot have gladdened
V-ing perfect
I cannot have been gladdening you cannot have been gladdening she cannot have been gladdening we cannot have been gladdening you cannot have been gladdening they cannot have been gladdening
Interrogative form
Simple form
can I gladden? can you gladden? can she gladden? can we gladden? can you gladden? can they gladden?
V-ing form
can I be gladdening? can you be gladdening? can she be gladdening? can we be gladdening? can you be gladdening? can they be gladdening?
Perfect
can I have gladdened? can you have gladdened? can she 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 she have been gladdening? can we have been gladdening? can you have been gladdening? can they have been gladdening?
Interro-negative form
Simple form
can I not gladden? can you not gladden? can she not gladden? can we not gladden? can you not gladden? can they not gladden?
V-ing form
can I not be gladdening? can you not be gladdening? can she not be gladdening? can we not be gladdening? can you not be gladdening? can they not be gladdening?
Perfect
can I not have gladdened? can you not have gladdened? can she not have gladdened? can we not have gladdened? can you not have gladdened? can they not have gladdened?
V-ing perfect
can I not have been gladdening? can you not have been gladdening? can she not have been gladdening? can we not have been gladdening? can you not have been gladdening? can they not have been gladdening?