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