
Verbo regular: seem - seemed - seemed
| Forma simple | Forma con V-ing | 
| - - it should seem - - - | - - it should be seeming - - - | 
| Perfecto | Perfecto con V-ing | 
| - - it should have seemed - - - | - - it should have been seeming - - - | 
| Forma simple | Forma con V-ing | 
| - - it should not seem - - - | - - it should not be seeming - - - | 
| Perfecto | Perfecto con V-ing | 
| - - it should not have seemed - - - | - - it should not have been seeming - - - | 
| Forma simple | Forma con V-ing | 
| - - should it seem? - - - | - - should it be seeming? - - - | 
| Perfecto | Perfecto con V-ing | 
| - - should it have seemed? - - - | - - should it have been seeming? - - - | 
| Forma simple | Forma con V-ing | 
| - - should it not seem? - - - | - - should it not be seeming? - - - | 
| Perfecto | Perfecto con V-ing | 
| - - should it not have seemed? - - - | - - should it not have been seeming? - - - |