must precess
Verbo regular: precess - precessed- precessed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must precess
you must precess
he must precess
we must precess
you must precess
they must precess 	I must be precessing
you must be precessing
he must be precessing
we must be precessing
you must be precessing
they must be precessing	I must have precessed
you must have precessed
he must have precessed
we must have precessed
you must have precessed
they must have precessed	I must have been precessing
you must have been precessing
he must have been precessing
we must have been precessing
you must have been precessing
they must have been precessing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't precess
you mustn't precess
he mustn't precess
we mustn't precess
you mustn't precess
they mustn't precess 	I mustn't be precessing
you mustn't be precessing
he mustn't be precessing
we mustn't be precessing
you mustn't be precessing
they mustn't be precessing	I mustn't have precessed
you mustn't have precessed
he mustn't have precessed
we mustn't have precessed
you mustn't have precessed
they mustn't have precessed	I mustn't have been precessing
you mustn't have been precessing
he mustn't have been precessing
we mustn't have been precessing
you mustn't have been precessing
they mustn't have been precessing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I precess?
must you precess?
must he precess?
must we precess?
must you precess?
must they precess? 	must I be precessing?
must you be precessing?
must he be precessing?
must we be precessing?
must you be precessing?
must they be precessing? 	must I have precessed?
must you have precessed?
must he have precessed?
must we have precessed?
must you have precessed?
must they have precessed? 	must I have been precessing?
must you have been precessing?
must he have been precessing?
must we have been precessing?
must you have been precessing?
must they have been precessing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I precess?
mustn't you precess?
mustn't he precess?
mustn't we precess?
mustn't you precess?
mustn't they precess? 	mustn't I be precessing?
mustn't you be precessing?
mustn't he be precessing?
mustn't we be precessing?
mustn't you be precessing?
mustn't they be precessing? 	mustn't I have precessed?
mustn't you have precessed?
mustn't he have precessed?
mustn't we have precessed?
mustn't you have precessed?
mustn't they have precessed? 	mustn't I have been precessing?
mustn't you have been precessing?
mustn't he have been precessing?
mustn't we have been precessing?
mustn't you have been precessing?
mustn't they have been precessing?