must precaution
Verbo regular: precaution - precautioned- precautioned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must precaution
you must precaution
he must precaution
we must precaution
you must precaution
they must precaution 	I must be precautioning
you must be precautioning
he must be precautioning
we must be precautioning
you must be precautioning
they must be precautioning	I must have precautioned
you must have precautioned
he must have precautioned
we must have precautioned
you must have precautioned
they must have precautioned	I must have been precautioning
you must have been precautioning
he must have been precautioning
we must have been precautioning
you must have been precautioning
they must have been precautioning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't precaution
you mustn't precaution
he mustn't precaution
we mustn't precaution
you mustn't precaution
they mustn't precaution 	I mustn't be precautioning
you mustn't be precautioning
he mustn't be precautioning
we mustn't be precautioning
you mustn't be precautioning
they mustn't be precautioning	I mustn't have precautioned
you mustn't have precautioned
he mustn't have precautioned
we mustn't have precautioned
you mustn't have precautioned
they mustn't have precautioned	I mustn't have been precautioning
you mustn't have been precautioning
he mustn't have been precautioning
we mustn't have been precautioning
you mustn't have been precautioning
they mustn't have been precautioning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I precaution?
must you precaution?
must he precaution?
must we precaution?
must you precaution?
must they precaution? 	must I be precautioning?
must you be precautioning?
must he be precautioning?
must we be precautioning?
must you be precautioning?
must they be precautioning? 	must I have precautioned?
must you have precautioned?
must he have precautioned?
must we have precautioned?
must you have precautioned?
must they have precautioned? 	must I have been precautioning?
must you have been precautioning?
must he have been precautioning?
must we have been precautioning?
must you have been precautioning?
must they have been precautioning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I precaution?
mustn't you precaution?
mustn't he precaution?
mustn't we precaution?
mustn't you precaution?
mustn't they precaution? 	mustn't I be precautioning?
mustn't you be precautioning?
mustn't he be precautioning?
mustn't we be precautioning?
mustn't you be precautioning?
mustn't they be precautioning? 	mustn't I have precautioned?
mustn't you have precautioned?
mustn't he have precautioned?
mustn't we have precautioned?
mustn't you have precautioned?
mustn't they have precautioned? 	mustn't I have been precautioning?
mustn't you have been precautioning?
mustn't he have been precautioning?
mustn't we have been precautioning?
mustn't you have been precautioning?
mustn't they have been precautioning?