must crab
Verbo regular: crab - crabbed- crabbed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must crab
you must crab
she must crab
we must crab
you must crab
they must crab 	I must be crabbing
you must be crabbing
she must be crabbing
we must be crabbing
you must be crabbing
they must be crabbing	I must have crabbed
you must have crabbed
she must have crabbed
we must have crabbed
you must have crabbed
they must have crabbed	I must have been crabbing
you must have been crabbing
she must have been crabbing
we must have been crabbing
you must have been crabbing
they must have been crabbing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not crab
you must not crab
she must not crab
we must not crab
you must not crab
they must not crab 	I must not be crabbing
you must not be crabbing
she must not be crabbing
we must not be crabbing
you must not be crabbing
they must not be crabbing	I must not have crabbed
you must not have crabbed
she must not have crabbed
we must not have crabbed
you must not have crabbed
they must not have crabbed	I must not have been crabbing
you must not have been crabbing
she must not have been crabbing
we must not have been crabbing
you must not have been crabbing
they must not have been crabbing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I crab?
must you crab?
must she crab?
must we crab?
must you crab?
must they crab? 	must I be crabbing?
must you be crabbing?
must she be crabbing?
must we be crabbing?
must you be crabbing?
must they be crabbing? 	must I have crabbed?
must you have crabbed?
must she have crabbed?
must we have crabbed?
must you have crabbed?
must they have crabbed? 	must I have been crabbing?
must you have been crabbing?
must she have been crabbing?
must we have been crabbing?
must you have been crabbing?
must they have been crabbing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not crab?
must you not crab?
must she not crab?
must we not crab?
must you not crab?
must they not crab? 	must I not be crabbing?
must you not be crabbing?
must she not be crabbing?
must we not be crabbing?
must you not be crabbing?
must they not be crabbing? 	must I not have crabbed?
must you not have crabbed?
must she not have crabbed?
must we not have crabbed?
must you not have crabbed?
must they not have crabbed? 	must I not have been crabbing?
must you not have been crabbing?
must she not have been crabbing?
must we not have been crabbing?
must you not have been crabbing?
must they not have been crabbing?