
Regular verb: require - required - required
Simple form | V-ing form | 
| I may require you may require he may require we may require you may require they may require  | I may be requiring you may be requiring he may be requiring we may be requiring you may be requiring they may be requiring  | 
Perfect | V-ing perfect | 
| I may have required you may have required he may have required we may have required you may have required they may have required  | I may have been requiring you may have been requiring he may have been requiring we may have been requiring you may have been requiring they may have been requiring  | 
Simple form | V-ing form | 
| I mayn't require you mayn't require he mayn't require we mayn't require you mayn't require they mayn't require  | I mayn't be requiring you mayn't be requiring he mayn't be requiring we mayn't be requiring you mayn't be requiring they mayn't be requiring  | 
Perfect | V-ing perfect | 
| I mayn't have required you mayn't have required he mayn't have required we mayn't have required you mayn't have required they mayn't have required  | I mayn't have been requiring you mayn't have been requiring he mayn't have been requiring we mayn't have been requiring you mayn't have been requiring they mayn't have been requiring  | 
Simple form | V-ing form | 
| may I require? may you require? may he require? may we require? may you require? may they require?  | may I be requiring? may you be requiring? may he be requiring? may we be requiring? may you be requiring? may they be requiring?  | 
Perfect | V-ing perfect | 
| may I have required? may you have required? may he have required? may we have required? may you have required? may they have required?  | may I have been requiring? may you have been requiring? may he have been requiring? may we have been requiring? may you have been requiring? may they have been requiring?  | 
Simple form | V-ing form | 
| mayn't I require? mayn't you require? mayn't he require? mayn't we require? mayn't you require? mayn't they require?  | mayn't I be requiring? mayn't you be requiring? mayn't he be requiring? mayn't we be requiring? mayn't you be requiring? mayn't they be requiring?  | 
Perfect | V-ing perfect | 
| mayn't I have required? mayn't you have required? mayn't he have required? mayn't we have required? mayn't you have required? mayn't they have required?  | mayn't I have been requiring? mayn't you have been requiring? mayn't he have been requiring? mayn't we have been requiring? mayn't you have been requiring? mayn't they have been requiring?  |