
Verbo irregular: grind - ground - ground
Forma simple | Forma con V-ing | 
| I may grind you may grind she may grind we may grind you may grind they may grind  | I may be grinding you may be grinding she may be grinding we may be grinding you may be grinding they may be grinding  | 
Perfecto | Perfecto con V-ing | 
| I may have ground you may have ground she may have ground we may have ground you may have ground they may have ground  | I may have been grinding you may have been grinding she may have been grinding we may have been grinding you may have been grinding they may have been grinding  | 
Forma simple | Forma con V-ing | 
| I mayn't grind you mayn't grind she mayn't grind we mayn't grind you mayn't grind they mayn't grind  | I mayn't be grinding you mayn't be grinding she mayn't be grinding we mayn't be grinding you mayn't be grinding they mayn't be grinding  | 
Perfecto | Perfecto con V-ing | 
| I mayn't have ground you mayn't have ground she mayn't have ground we mayn't have ground you mayn't have ground they mayn't have ground  | I mayn't have been grinding you mayn't have been grinding she mayn't have been grinding we mayn't have been grinding you mayn't have been grinding they mayn't have been grinding  | 
Forma simple | Forma con V-ing | 
| may I grind? may you grind? may she grind? may we grind? may you grind? may they grind?  | may I be grinding? may you be grinding? may she be grinding? may we be grinding? may you be grinding? may they be grinding?  | 
Perfecto | Perfecto con V-ing | 
| may I have ground? may you have ground? may she have ground? may we have ground? may you have ground? may they have ground?  | may I have been grinding? may you have been grinding? may she have been grinding? may we have been grinding? may you have been grinding? may they have been grinding?  | 
Forma simple | Forma con V-ing | 
| mayn't I grind? mayn't you grind? mayn't she grind? mayn't we grind? mayn't you grind? mayn't they grind?  | mayn't I be grinding? mayn't you be grinding? mayn't she be grinding? mayn't we be grinding? mayn't you be grinding? mayn't they be grinding?  | 
Perfecto | Perfecto con V-ing | 
| mayn't I have ground? mayn't you have ground? mayn't she have ground? mayn't we have ground? mayn't you have ground? mayn't they have ground?  | mayn't I have been grinding? mayn't you have been grinding? mayn't she have been grinding? mayn't we have been grinding? mayn't you have been grinding? mayn't they have been grinding?  |