I can forecast you can forecast he can forecast we can forecast you can forecast they can forecast
V-ing form
I can be forecasting you can be forecasting he can be forecasting we can be forecasting you can be forecasting they can be forecasting
Perfect
I can have forecast you can have forecast he can have forecast we can have forecast you can have forecast they can have forecast
V-ing perfect
I can have been forecasting you can have been forecasting he can have been forecasting we can have been forecasting you can have been forecasting they can have been forecasting
Negation
Simple form
I can't forecast you can't forecast he can't forecast we can't forecast you can't forecast they can't forecast
V-ing form
I can't be forecasting you can't be forecasting he can't be forecasting we can't be forecasting you can't be forecasting they can't be forecasting
Perfect
I can't have forecast you can't have forecast he can't have forecast we can't have forecast you can't have forecast they can't have forecast
V-ing perfect
I can't have been forecasting you can't have been forecasting he can't have been forecasting we can't have been forecasting you can't have been forecasting they can't have been forecasting
Interrogative form
Simple form
can I forecast? can you forecast? can he forecast? can we forecast? can you forecast? can they forecast?
V-ing form
can I be forecasting? can you be forecasting? can he be forecasting? can we be forecasting? can you be forecasting? can they be forecasting?
Perfect
can I have forecast? can you have forecast? can he have forecast? can we have forecast? can you have forecast? can they have forecast?
V-ing perfect
can I have been forecasting? can you have been forecasting? can he have been forecasting? can we have been forecasting? can you have been forecasting? can they have been forecasting?
Interro-negative form
Simple form
can't I forecast? can't you forecast? can't he forecast? can't we forecast? can't you forecast? can't they forecast?
V-ing form
can't I be forecasting? can't you be forecasting? can't he be forecasting? can't we be forecasting? can't you be forecasting? can't they be forecasting?
Perfect
can't I have forecast? can't you have forecast? can't he have forecast? can't we have forecast? can't you have forecast? can't they have forecast?
V-ing perfect
can't I have been forecasting? can't you have been forecasting? can't he have been forecasting? can't we have been forecasting? can't you have been forecasting? can't they have been forecasting?