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