
Regular verb: decay - decayed - decayed
Simple form | V-ing form | 
| I'd decay you'd decay he'd decay we'd decay you'd decay they'd decay  | I'd be decaying you'd be decaying he'd be decaying we'd be decaying you'd be decaying they'd be decaying  | 
Perfect | V-ing perfect | 
| I should've decayed you should've decayed he should've decayed we should've decayed you should've decayed they should've decayed  | I should've been decaying you should've been decaying he should've been decaying we should've been decaying you should've been decaying they should've been decaying  | 
Simple form | V-ing form | 
| I shouldn't decay you shouldn't decay he shouldn't decay we shouldn't decay you shouldn't decay they shouldn't decay  | I shouldn't be decaying you shouldn't be decaying he shouldn't be decaying we shouldn't be decaying you shouldn't be decaying they shouldn't be decaying  | 
Perfect | V-ing perfect | 
| I shouldn't have decayed you shouldn't have decayed he shouldn't have decayed we shouldn't have decayed you shouldn't have decayed they shouldn't have decayed  | I shouldn't have been decaying you shouldn't have been decaying he shouldn't have been decaying we shouldn't have been decaying you shouldn't have been decaying they shouldn't have been decaying  | 
Simple form | V-ing form | 
| should I decay? should you decay? should he decay? should we decay? should you decay? should they decay?  | should I be decaying? should you be decaying? should he be decaying? should we be decaying? should you be decaying? should they be decaying?  | 
Perfect | V-ing perfect | 
| should I have decayed? should you have decayed? should he have decayed? should we have decayed? should you have decayed? should they have decayed?  | should I have been decaying? should you have been decaying? should he have been decaying? should we have been decaying? should you have been decaying? should they have been decaying?  | 
Simple form | V-ing form | 
| shouldn't I decay? shouldn't you decay? shouldn't he decay? shouldn't we decay? shouldn't you decay? shouldn't they decay?  | shouldn't I be decaying? shouldn't you be decaying? shouldn't he be decaying? shouldn't we be decaying? shouldn't you be decaying? shouldn't they be decaying?  | 
Perfect | V-ing perfect | 
| shouldn't I have decayed? shouldn't you have decayed? shouldn't he have decayed? shouldn't we have decayed? shouldn't you have decayed? shouldn't they have decayed?  | shouldn't I have been decaying? shouldn't you have been decaying? shouldn't he have been decaying? shouldn't we have been decaying? shouldn't you have been decaying? shouldn't they have been decaying?  |