I could forecast you could forecast she could forecast we could forecast you could forecast they could forecast
V-ing form
I could be forecasting you could be forecasting she could be forecasting we could be forecasting you could be forecasting they could be forecasting
Perfect
I could have forecast you could have forecast she could have forecast we could have forecast you could have forecast they could have forecast
V-ing perfect
I could have been forecasting you could have been forecasting she could have been forecasting we could have been forecasting you could have been forecasting they could have been forecasting
Negation
Simple form
I could not forecast you could not forecast she could not forecast we could not forecast you could not forecast they could not forecast
V-ing form
I could not be forecasting you could not be forecasting she could not be forecasting we could not be forecasting you could not be forecasting they could not be forecasting
Perfect
I could not have forecast you could not have forecast she could not have forecast we could not have forecast you could not have forecast they could not have forecast
V-ing perfect
I could not have been forecasting you could not have been forecasting she could not have been forecasting we could not have been forecasting you could not have been forecasting they could not have been forecasting
Interrogative form
Simple form
could I forecast? could you forecast? could she forecast? could we forecast? could you forecast? could they forecast?
V-ing form
could I be forecasting? could you be forecasting? could she be forecasting? could we be forecasting? could you be forecasting? could they be forecasting?
Perfect
could I have forecast? could you have forecast? could she have forecast? could we have forecast? could you have forecast? could they have forecast?
V-ing perfect
could I have been forecasting? could you have been forecasting? could she have been forecasting? could we have been forecasting? could you have been forecasting? could they have been forecasting?
Interro-negative form
Simple form
could I not forecast? could you not forecast? could she not forecast? could we not forecast? could you not forecast? could they not forecast?
V-ing form
could I not be forecasting? could you not be forecasting? could she not be forecasting? could we not be forecasting? could you not be forecasting? could they not be forecasting?
Perfect
could I not have forecast? could you not have forecast? could she not have forecast? could we not have forecast? could you not have forecast? could they not have forecast?
V-ing perfect
could I not have been forecasting? could you not have been forecasting? could she not have been forecasting? could we not have been forecasting? could you not have been forecasting? could they not have been forecasting?