ought to crab
Regular verb: crab - crabbed- crabbed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to crab
you oughtn't to crab
she oughtn't to crab
we oughtn't to crab
you oughtn't to crab
they oughtn't to crab 	I oughtn't to be crabbing
you oughtn't to be crabbing
she oughtn't to be crabbing
we oughtn't to be crabbing
you oughtn't to be crabbing
they oughtn't to be crabbing	I oughtn't to have crabbed
you oughtn't to have crabbed
she oughtn't to have crabbed
we oughtn't to have crabbed
you oughtn't to have crabbed
they oughtn't to have crabbed	I oughtn't to have been crabbing
you oughtn't to have been crabbing
she oughtn't to have been crabbing
we oughtn't to have been crabbing
you oughtn't to have been crabbing
they oughtn't to have been crabbing	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to crab?
oughtn't you to crab?
oughtn't she to crab?
oughtn't we to crab?
oughtn't you to crab?
oughtn't they to crab? 	oughtn't I to be crabbing?
oughtn't you to be crabbing?
oughtn't she to be crabbing?
oughtn't we to be crabbing?
oughtn't you to be crabbing?
oughtn't they to be crabbing? 	oughtn't I to have crabbed?
oughtn't you to have crabbed?
oughtn't she to have crabbed?
oughtn't we to have crabbed?
oughtn't you to have crabbed?
oughtn't they to have crabbed? 	oughtn't I to have been crabbing?
oughtn't you to have been crabbing?
oughtn't she to have been crabbing?
oughtn't we to have been crabbing?
oughtn't you to have been crabbing?
oughtn't they to have been crabbing?