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