I could redemonstrate you could redemonstrate he could redemonstrate we could redemonstrate you could redemonstrate they could redemonstrate
V-ing form
I could be redemonstrating you could be redemonstrating he could be redemonstrating we could be redemonstrating you could be redemonstrating they could be redemonstrating
Perfect
I could have redemonstrated you could have redemonstrated he could have redemonstrated we could have redemonstrated you could have redemonstrated they could have redemonstrated
V-ing perfect
I could have been redemonstrating you could have been redemonstrating he could have been redemonstrating we could have been redemonstrating you could have been redemonstrating they could have been redemonstrating
Negation
Simple form
I couldn't redemonstrate you couldn't redemonstrate he couldn't redemonstrate we couldn't redemonstrate you couldn't redemonstrate they couldn't redemonstrate
V-ing form
I couldn't be redemonstrating you couldn't be redemonstrating he couldn't be redemonstrating we couldn't be redemonstrating you couldn't be redemonstrating they couldn't be redemonstrating
Perfect
I couldn't have redemonstrated you couldn't have redemonstrated he couldn't have redemonstrated we couldn't have redemonstrated you couldn't have redemonstrated they couldn't have redemonstrated
V-ing perfect
I couldn't have been redemonstrating you couldn't have been redemonstrating he couldn't have been redemonstrating we couldn't have been redemonstrating you couldn't have been redemonstrating they couldn't have been redemonstrating
Interrogative form
Simple form
could I redemonstrate? could you redemonstrate? could he redemonstrate? could we redemonstrate? could you redemonstrate? could they redemonstrate?
V-ing form
could I be redemonstrating? could you be redemonstrating? could he be redemonstrating? could we be redemonstrating? could you be redemonstrating? could they be redemonstrating?
Perfect
could I have redemonstrated? could you have redemonstrated? could he have redemonstrated? could we have redemonstrated? could you have redemonstrated? could they have redemonstrated?
V-ing perfect
could I have been redemonstrating? could you have been redemonstrating? could he have been redemonstrating? could we have been redemonstrating? could you have been redemonstrating? could they have been redemonstrating?
Interro-negative form
Simple form
couldn't I redemonstrate? couldn't you redemonstrate? couldn't he redemonstrate? couldn't we redemonstrate? couldn't you redemonstrate? couldn't they redemonstrate?
V-ing form
couldn't I be redemonstrating? couldn't you be redemonstrating? couldn't he be redemonstrating? couldn't we be redemonstrating? couldn't you be redemonstrating? couldn't they be redemonstrating?
Perfect
couldn't I have redemonstrated? couldn't you have redemonstrated? couldn't he have redemonstrated? couldn't we have redemonstrated? couldn't you have redemonstrated? couldn't they have redemonstrated?
V-ing perfect
couldn't I have been redemonstrating? couldn't you have been redemonstrating? couldn't he have been redemonstrating? couldn't we have been redemonstrating? couldn't you have been redemonstrating? couldn't they have been redemonstrating?