can crab
Regular verb: crab - crabbed- crabbed

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

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I crab?
can you crab?
can she crab?
can we crab?
can you crab?
can they crab? 	can I be crabbing?
can you be crabbing?
can she be crabbing?
can we be crabbing?
can you be crabbing?
can they be crabbing? 	can I have crabbed?
can you have crabbed?
can she have crabbed?
can we have crabbed?
can you have crabbed?
can they have crabbed? 	can I have been crabbing?
can you have been crabbing?
can she have been crabbing?
can we have been crabbing?
can you have been crabbing?
can they have been crabbing? 	

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