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 could not quadruplicate you could not quadruplicate he could not quadruplicate we could not quadruplicate you could not quadruplicate they could not quadruplicate
V-ing form
I could not be quadruplicating you could not be quadruplicating he could not be quadruplicating we could not be quadruplicating you could not be quadruplicating they could not be quadruplicating
Perfect
I could not have quadruplicated you could not have quadruplicated he could not have quadruplicated we could not have quadruplicated you could not have quadruplicated they could not have quadruplicated
V-ing perfect
I could not have been quadruplicating you could not have been quadruplicating he could not have been quadruplicating we could not have been quadruplicating you could not have been quadruplicating they could not 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
could I not quadruplicate? could you not quadruplicate? could he not quadruplicate? could we not quadruplicate? could you not quadruplicate? could they not quadruplicate?
V-ing form
could I not be quadruplicating? could you not be quadruplicating? could he not be quadruplicating? could we not be quadruplicating? could you not be quadruplicating? could they not be quadruplicating?
Perfect
could I not have quadruplicated? could you not have quadruplicated? could he not have quadruplicated? could we not have quadruplicated? could you not have quadruplicated? could they not have quadruplicated?
V-ing perfect
could I not have been quadruplicating? could you not have been quadruplicating? could he not have been quadruplicating? could we not have been quadruplicating? could you not have been quadruplicating? could they not have been quadruplicating?