should crab
Regular verb: crab - crabbed- crabbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should crab
you should crab
he should crab
we should crab
you should crab
they should crab 	I should be crabbing
you should be crabbing
he should be crabbing
we should be crabbing
you should be crabbing
they should be crabbing	I should have crabbed
you should have crabbed
he should have crabbed
we should have crabbed
you should have crabbed
they should have crabbed	I should have been crabbing
you should have been crabbing
he should have been crabbing
we should have been crabbing
you should have been crabbing
they should have been crabbing	

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