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