
Verbo regolare: seem - seemed - seemed
| Forma semplice | Forma con V-ing | 
| - - it must seem - - - | - - it must be seeming - - - | 
| Perfetto | Perfetto con V-ing | 
| - - it must have seemed - - - | - - it must have been seeming - - - | 
| Forma semplice | Forma con V-ing | 
| - - it must not seem - - - | - - it must not be seeming - - - | 
| Perfetto | Perfetto con V-ing | 
| - - it must not have seemed - - - | - - it must not have been seeming - - - | 
| Forma semplice | Forma con V-ing | 
| - - must it seem? - - - | - - must it be seeming? - - - | 
| Perfetto | Perfetto con V-ing | 
| - - must it have seemed? - - - | - - must it have been seeming? - - - | 
| Forma semplice | Forma con V-ing | 
| - - must it not seem? - - - | - - must it not be seeming? - - - | 
| Perfetto | Perfetto con V-ing | 
| - - must it not have seemed? - - - | - - must it not have been seeming? - - - |