English verb conjugation
COULD PRECESS

Regular verb: precess - precessed - precessed

Affirmation

Simple form	V-ing form
I could precess you could precess he could precess we could precess you could precess they could precess	I could be precessing you could be precessing he could be precessing we could be precessing you could be precessing they could be precessing
Perfect	V-ing perfect
I could have precessed you could have precessed he could have precessed we could have precessed you could have precessed they could have precessed	I could have been precessing you could have been precessing he could have been precessing we could have been precessing you could have been precessing they could have been precessing

Negation

Simple form	V-ing form
I could not precess you could not precess he could not precess we could not precess you could not precess they could not precess	I could not be precessing you could not be precessing he could not be precessing we could not be precessing you could not be precessing they could not be precessing
Perfect	V-ing perfect
I could not have precessed you could not have precessed he could not have precessed we could not have precessed you could not have precessed they could not have precessed	I could not have been precessing you could not have been precessing he could not have been precessing we could not have been precessing you could not have been precessing they could not have been precessing

Interrogative form

Simple form	V-ing form
could I precess? could you precess? could he precess? could we precess? could you precess? could they precess?	could I be precessing? could you be precessing? could he be precessing? could we be precessing? could you be precessing? could they be precessing?
Perfect	V-ing perfect
could I have precessed? could you have precessed? could he have precessed? could we have precessed? could you have precessed? could they have precessed?	could I have been precessing? could you have been precessing? could he have been precessing? could we have been precessing? could you have been precessing? could they have been precessing?

Interro-negative form

Simple form	V-ing form
could I not precess? could you not precess? could he not precess? could we not precess? could you not precess? could they not precess?	could I not be precessing? could you not be precessing? could he not be precessing? could we not be precessing? could you not be precessing? could they not be precessing?
Perfect	V-ing perfect
could I not have precessed? could you not have precessed? could he not have precessed? could we not have precessed? could you not have precessed? could they not have precessed?	could I not have been precessing? could you not have been precessing? could he not have been precessing? could we not have been precessing? could you not have been precessing? could they not have been precessing?