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