
Regular verb: seem - seemed - seemed
Simple form | V-ing form | 
| - - it ought to seem - - -  | - - it ought to be seeming - - -  | 
Perfect | V-ing perfect | 
| - - it ought to have seemed - - -  | - - it ought to have been seeming - - -  | 
Simple form | V-ing form | 
| - - it oughtn't to seem - - -  | - - it oughtn't to be seeming - - -  | 
Perfect | V-ing perfect | 
| - - it oughtn't to have seemed - - -  | - - it oughtn't to have been seeming - - -  | 
Simple form | V-ing form | 
| - - ought to it seem? - - -  | - - ought to it be seeming? - - -  | 
Perfect | V-ing perfect | 
| - - ought to it have seemed? - - -  | - - ought to it have been seeming? - - -  | 
Simple form | V-ing form | 
| - - oughtn't it to seem? - - -  | - - oughtn't it to be seeming? - - -  | 
Perfect | V-ing perfect | 
| - - oughtn't it to have seemed? - - -  | - - oughtn't it to have been seeming? - - -  |