I should crab you should crab she should crab we should crab you should crab they should crab
V-ing form
I should be crabbing you should be crabbing she should be crabbing we should be crabbing you should be crabbing they should be crabbing
Perfect
I should have crabbed you should have crabbed she should have crabbed we should have crabbed you should have crabbed they should have crabbed
V-ing perfect
I should have been crabbing you should have been crabbing she should have been crabbing we should have been crabbing you should have been crabbing they should have been crabbing
Negation
Simple form
I should not crab you should not crab she should not crab we should not crab you should not crab they should not crab
V-ing form
I should not be crabbing you should not be crabbing she should not be crabbing we should not be crabbing you should not be crabbing they should not be crabbing
Perfect
I should not have crabbed you should not have crabbed she should not have crabbed we should not have crabbed you should not have crabbed they should not have crabbed
V-ing perfect
I should not have been crabbing you should not have been crabbing she should not have been crabbing we should not have been crabbing you should not have been crabbing they should not 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
should I not crab? should you not crab? should she not crab? should we not crab? should you not crab? should they not crab?
V-ing form
should I not be crabbing? should you not be crabbing? should she not be crabbing? should we not be crabbing? should you not be crabbing? should they not be crabbing?
Perfect
should I not have crabbed? should you not have crabbed? should she not have crabbed? should we not have crabbed? should you not have crabbed? should they not have crabbed?
V-ing perfect
should I not have been crabbing? should you not have been crabbing? should she not have been crabbing? should we not have been crabbing? should you not have been crabbing? should they not have been crabbing?