
Verbo regolare: stack - stacked - stacked
Forma semplice | Forma con V-ing | 
| I may stack you may stack she may stack we may stack you may stack they may stack  | I may be stacking you may be stacking she may be stacking we may be stacking you may be stacking they may be stacking  | 
Perfetto | Perfetto con V-ing | 
| I may have stacked you may have stacked she may have stacked we may have stacked you may have stacked they may have stacked  | I may have been stacking you may have been stacking she may have been stacking we may have been stacking you may have been stacking they may have been stacking  | 
Forma semplice | Forma con V-ing | 
| I mayn't stack you mayn't stack she mayn't stack we mayn't stack you mayn't stack they mayn't stack  | I mayn't be stacking you mayn't be stacking she mayn't be stacking we mayn't be stacking you mayn't be stacking they mayn't be stacking  | 
Perfetto | Perfetto con V-ing | 
| I mayn't have stacked you mayn't have stacked she mayn't have stacked we mayn't have stacked you mayn't have stacked they mayn't have stacked  | I mayn't have been stacking you mayn't have been stacking she mayn't have been stacking we mayn't have been stacking you mayn't have been stacking they mayn't have been stacking  | 
Forma semplice | Forma con V-ing | 
| may I stack? may you stack? may she stack? may we stack? may you stack? may they stack?  | may I be stacking? may you be stacking? may she be stacking? may we be stacking? may you be stacking? may they be stacking?  | 
Perfetto | Perfetto con V-ing | 
| may I have stacked? may you have stacked? may she have stacked? may we have stacked? may you have stacked? may they have stacked?  | may I have been stacking? may you have been stacking? may she have been stacking? may we have been stacking? may you have been stacking? may they have been stacking?  | 
Forma semplice | Forma con V-ing | 
| mayn't I stack? mayn't you stack? mayn't she stack? mayn't we stack? mayn't you stack? mayn't they stack?  | mayn't I be stacking? mayn't you be stacking? mayn't she be stacking? mayn't we be stacking? mayn't you be stacking? mayn't they be stacking?  | 
Perfetto | Perfetto con V-ing | 
| mayn't I have stacked? mayn't you have stacked? mayn't she have stacked? mayn't we have stacked? mayn't you have stacked? mayn't they have stacked?  | mayn't I have been stacking? mayn't you have been stacking? mayn't she have been stacking? mayn't we have been stacking? mayn't you have been stacking? mayn't they have been stacking?  |