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