I could prognosticate you could prognosticate he could prognosticate we could prognosticate you could prognosticate they could prognosticate
V-ing form
I could be prognosticating you could be prognosticating he could be prognosticating we could be prognosticating you could be prognosticating they could be prognosticating
Perfect
I could have prognosticated you could have prognosticated he could have prognosticated we could have prognosticated you could have prognosticated they could have prognosticated
V-ing perfect
I could have been prognosticating you could have been prognosticating he could have been prognosticating we could have been prognosticating you could have been prognosticating they could have been prognosticating
Negation
Simple form
I could not prognosticate you could not prognosticate he could not prognosticate we could not prognosticate you could not prognosticate they could not prognosticate
V-ing form
I could not be prognosticating you could not be prognosticating he could not be prognosticating we could not be prognosticating you could not be prognosticating they could not be prognosticating
Perfect
I could not have prognosticated you could not have prognosticated he could not have prognosticated we could not have prognosticated you could not have prognosticated they could not have prognosticated
V-ing perfect
I could not have been prognosticating you could not have been prognosticating he could not have been prognosticating we could not have been prognosticating you could not have been prognosticating they could not have been prognosticating
Interrogative form
Simple form
could I prognosticate? could you prognosticate? could he prognosticate? could we prognosticate? could you prognosticate? could they prognosticate?
V-ing form
could I be prognosticating? could you be prognosticating? could he be prognosticating? could we be prognosticating? could you be prognosticating? could they be prognosticating?
Perfect
could I have prognosticated? could you have prognosticated? could he have prognosticated? could we have prognosticated? could you have prognosticated? could they have prognosticated?
V-ing perfect
could I have been prognosticating? could you have been prognosticating? could he have been prognosticating? could we have been prognosticating? could you have been prognosticating? could they have been prognosticating?
Interro-negative form
Simple form
could I not prognosticate? could you not prognosticate? could he not prognosticate? could we not prognosticate? could you not prognosticate? could they not prognosticate?
V-ing form
could I not be prognosticating? could you not be prognosticating? could he not be prognosticating? could we not be prognosticating? could you not be prognosticating? could they not be prognosticating?
Perfect
could I not have prognosticated? could you not have prognosticated? could he not have prognosticated? could we not have prognosticated? could you not have prognosticated? could they not have prognosticated?
V-ing perfect
could I not have been prognosticating? could you not have been prognosticating? could he not have been prognosticating? could we not have been prognosticating? could you not have been prognosticating? could they not have been prognosticating?