I could prognosticate you could prognosticate she could prognosticate we could prognosticate you could prognosticate they could prognosticate
V-ing form
I could be prognosticating you could be prognosticating she could be prognosticating we could be prognosticating you could be prognosticating they could be prognosticating
Perfect
I could have prognosticated you could have prognosticated she 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 she could have been prognosticating we could have been prognosticating you could have been prognosticating they could have been prognosticating
Negation
Simple form
I couldn't prognosticate you couldn't prognosticate she couldn't prognosticate we couldn't prognosticate you couldn't prognosticate they couldn't prognosticate
V-ing form
I couldn't be prognosticating you couldn't be prognosticating she couldn't be prognosticating we couldn't be prognosticating you couldn't be prognosticating they couldn't be prognosticating
Perfect
I couldn't have prognosticated you couldn't have prognosticated she couldn't have prognosticated we couldn't have prognosticated you couldn't have prognosticated they couldn't have prognosticated
V-ing perfect
I couldn't have been prognosticating you couldn't have been prognosticating she couldn't have been prognosticating we couldn't have been prognosticating you couldn't have been prognosticating they couldn't have been prognosticating
Interrogative form
Simple form
could I prognosticate? could you prognosticate? could she prognosticate? could we prognosticate? could you prognosticate? could they prognosticate?
V-ing form
could I be prognosticating? could you be prognosticating? could she be prognosticating? could we be prognosticating? could you be prognosticating? could they be prognosticating?
Perfect
could I have prognosticated? could you have prognosticated? could she 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 she have been prognosticating? could we have been prognosticating? could you have been prognosticating? could they have been prognosticating?
Interro-negative form
Simple form
couldn't I prognosticate? couldn't you prognosticate? couldn't she prognosticate? couldn't we prognosticate? couldn't you prognosticate? couldn't they prognosticate?
V-ing form
couldn't I be prognosticating? couldn't you be prognosticating? couldn't she be prognosticating? couldn't we be prognosticating? couldn't you be prognosticating? couldn't they be prognosticating?
Perfect
couldn't I have prognosticated? couldn't you have prognosticated? couldn't she have prognosticated? couldn't we have prognosticated? couldn't you have prognosticated? couldn't they have prognosticated?
V-ing perfect
couldn't I have been prognosticating? couldn't you have been prognosticating? couldn't she have been prognosticating? couldn't we have been prognosticating? couldn't you have been prognosticating? couldn't they have been prognosticating?