I'd be crabbing you'd be crabbing he'd be crabbing we'd be crabbing you'd be crabbing they'd be crabbing
Perfect
I should've crabbed you should've crabbed he should've crabbed we should've crabbed you should've crabbed they should've crabbed
V-ing perfect
I should've been crabbing you should've been crabbing he should've been crabbing we should've been crabbing you should've been crabbing they should've been crabbing
Negation
Simple form
I shouldn't crab you shouldn't crab he shouldn't crab we shouldn't crab you shouldn't crab they shouldn't crab
V-ing form
I shouldn't be crabbing you shouldn't be crabbing he shouldn't be crabbing we shouldn't be crabbing you shouldn't be crabbing they shouldn't be crabbing
Perfect
I shouldn't have crabbed you shouldn't have crabbed he shouldn't have crabbed we shouldn't have crabbed you shouldn't have crabbed they shouldn't have crabbed
V-ing perfect
I shouldn't have been crabbing you shouldn't have been crabbing he shouldn't have been crabbing we shouldn't have been crabbing you shouldn't have been crabbing they shouldn't have been crabbing
Interrogative form
Simple form
should I crab? should you crab? should he crab? should we crab? should you crab? should they crab?
V-ing form
should I be crabbing? should you be crabbing? should he be crabbing? should we be crabbing? should you be crabbing? should they be crabbing?
Perfect
should I have crabbed? should you have crabbed? should he have crabbed? should we have crabbed? should you have crabbed? should they have crabbed?
V-ing perfect
should I have been crabbing? should you have been crabbing? should he have been crabbing? should we have been crabbing? should you have been crabbing? should they have been crabbing?
Interro-negative form
Simple form
shouldn't I crab? shouldn't you crab? shouldn't he crab? shouldn't we crab? shouldn't you crab? shouldn't they crab?
V-ing form
shouldn't I be crabbing? shouldn't you be crabbing? shouldn't he be crabbing? shouldn't we be crabbing? shouldn't you be crabbing? shouldn't they be crabbing?
Perfect
shouldn't I have crabbed? shouldn't you have crabbed? shouldn't he have crabbed? shouldn't we have crabbed? shouldn't you have crabbed? shouldn't they have crabbed?
V-ing perfect
shouldn't I have been crabbing? shouldn't you have been crabbing? shouldn't he have been crabbing? shouldn't we have been crabbing? shouldn't you have been crabbing? shouldn't they have been crabbing?