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