
Verbo regular: observe - observed - observed
Forma simple | Forma con V-ing | 
| I'd observe you'd observe he'd observe we'd observe you'd observe they'd observe  | I'd be observing you'd be observing he'd be observing we'd be observing you'd be observing they'd be observing  | 
Perfecto | Perfecto con V-ing | 
| I should've observed you should've observed he should've observed we should've observed you should've observed they should've observed  | I should've been observing you should've been observing he should've been observing we should've been observing you should've been observing they should've been observing  | 
Forma simple | Forma con V-ing | 
| I shouldn't observe you shouldn't observe he shouldn't observe we shouldn't observe you shouldn't observe they shouldn't observe  | I shouldn't be observing you shouldn't be observing he shouldn't be observing we shouldn't be observing you shouldn't be observing they shouldn't be observing  | 
Perfecto | Perfecto con V-ing | 
| I shouldn't have observed you shouldn't have observed he shouldn't have observed we shouldn't have observed you shouldn't have observed they shouldn't have observed  | I shouldn't have been observing you shouldn't have been observing he shouldn't have been observing we shouldn't have been observing you shouldn't have been observing they shouldn't have been observing  | 
Forma simple | Forma con V-ing | 
| should I observe? should you observe? should he observe? should we observe? should you observe? should they observe?  | should I be observing? should you be observing? should he be observing? should we be observing? should you be observing? should they be observing?  | 
Perfecto | Perfecto con V-ing | 
| should I have observed? should you have observed? should he have observed? should we have observed? should you have observed? should they have observed?  | should I have been observing? should you have been observing? should he have been observing? should we have been observing? should you have been observing? should they have been observing?  | 
Forma simple | Forma con V-ing | 
| shouldn't I observe? shouldn't you observe? shouldn't he observe? shouldn't we observe? shouldn't you observe? shouldn't they observe?  | shouldn't I be observing? shouldn't you be observing? shouldn't he be observing? shouldn't we be observing? shouldn't you be observing? shouldn't they be observing?  | 
Perfecto | Perfecto con V-ing | 
| shouldn't I have observed? shouldn't you have observed? shouldn't he have observed? shouldn't we have observed? shouldn't you have observed? shouldn't they have observed?  | shouldn't I have been observing? shouldn't you have been observing? shouldn't he have been observing? shouldn't we have been observing? shouldn't you have been observing? shouldn't they have been observing?  |