can precess
Regular verb: precess - precessed- precessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can precess
you can precess
she can precess
we can precess
you can precess
they can precess 	I can be precessing
you can be precessing
she can be precessing
we can be precessing
you can be precessing
they can be precessing	I can have precessed
you can have precessed
she 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
she can have been precessing
we can have been precessing
you can have been precessing
they can have been precessing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot precess
you cannot precess
she cannot precess
we cannot precess
you cannot precess
they cannot precess 	I cannot be precessing
you cannot be precessing
she cannot be precessing
we cannot be precessing
you cannot be precessing
they cannot be precessing	I cannot have precessed
you cannot have precessed
she 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
she cannot have been precessing
we cannot have been precessing
you cannot have been precessing
they cannot have been precessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I precess?
can you precess?
can she precess?
can we precess?
can you precess?
can they precess? 	can I be precessing?
can you be precessing?
can she be precessing?
can we be precessing?
can you be precessing?
can they be precessing? 	can I have precessed?
can you have precessed?
can she 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 she have been precessing?
can we have been precessing?
can you have been precessing?
can they have been precessing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not precess?
can you not precess?
can she 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 she 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 she 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 she not have been precessing?
can we not have been precessing?
can you not have been precessing?
can they not have been precessing?