must crew
Verbo regular: crew - crewed- crewed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must crew
you must crew
he must crew
we must crew
you must crew
they must crew 	I must be crewing
you must be crewing
he must be crewing
we must be crewing
you must be crewing
they must be crewing	I must have crewed
you must have crewed
he must have crewed
we must have crewed
you must have crewed
they must have crewed	I must have been crewing
you must have been crewing
he must have been crewing
we must have been crewing
you must have been crewing
they must have been crewing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't crew
you mustn't crew
he mustn't crew
we mustn't crew
you mustn't crew
they mustn't crew 	I mustn't be crewing
you mustn't be crewing
he mustn't be crewing
we mustn't be crewing
you mustn't be crewing
they mustn't be crewing	I mustn't have crewed
you mustn't have crewed
he mustn't have crewed
we mustn't have crewed
you mustn't have crewed
they mustn't have crewed	I mustn't have been crewing
you mustn't have been crewing
he mustn't have been crewing
we mustn't have been crewing
you mustn't have been crewing
they mustn't have been crewing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I crew?
must you crew?
must he crew?
must we crew?
must you crew?
must they crew? 	must I be crewing?
must you be crewing?
must he be crewing?
must we be crewing?
must you be crewing?
must they be crewing? 	must I have crewed?
must you have crewed?
must he have crewed?
must we have crewed?
must you have crewed?
must they have crewed? 	must I have been crewing?
must you have been crewing?
must he have been crewing?
must we have been crewing?
must you have been crewing?
must they have been crewing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I crew?
mustn't you crew?
mustn't he crew?
mustn't we crew?
mustn't you crew?
mustn't they crew? 	mustn't I be crewing?
mustn't you be crewing?
mustn't he be crewing?
mustn't we be crewing?
mustn't you be crewing?
mustn't they be crewing? 	mustn't I have crewed?
mustn't you have crewed?
mustn't he have crewed?
mustn't we have crewed?
mustn't you have crewed?
mustn't they have crewed? 	mustn't I have been crewing?
mustn't you have been crewing?
mustn't he have been crewing?
mustn't we have been crewing?
mustn't you have been crewing?
mustn't they have been crewing?