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