I'd be crabbing you'd be crabbing she'd be crabbing we'd be crabbing you'd be crabbing they'd be crabbing
Perfect
I should've crabbed you should've crabbed she 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 she 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 she 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 she 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 she 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 she 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 she crab? should we crab? should you crab? should they crab?
V-ing form
should I be crabbing? should you be crabbing? should she be crabbing? should we be crabbing? should you be crabbing? should they be crabbing?
Perfect
should I have crabbed? should you have crabbed? should she 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 she 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 she 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 she 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 she 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 she have been crabbing? shouldn't we have been crabbing? shouldn't you have been crabbing? shouldn't they have been crabbing?