can precess
Verbo regular: precess - precessed- precessed

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

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

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

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