English verb conjugation
COULD PRECESS

Regular verb: precess - precessed - precessed

Affirmation

Simple form	V-ing form
I could precess you could precess she could precess we could precess you could precess they could precess	I could be precessing you could be precessing she 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 she 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 she 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 couldn't precess you couldn't precess she couldn't precess we couldn't precess you couldn't precess they couldn't precess	I couldn't be precessing you couldn't be precessing she couldn't be precessing we couldn't be precessing you couldn't be precessing they couldn't be precessing
Perfect	V-ing perfect
I couldn't have precessed you couldn't have precessed she couldn't have precessed we couldn't have precessed you couldn't have precessed they couldn't have precessed	I couldn't have been precessing you couldn't have been precessing she couldn't have been precessing we couldn't have been precessing you couldn't have been precessing they couldn't have been precessing

Interrogative form

Simple form	V-ing form
could I precess? could you precess? could she precess? could we precess? could you precess? could they precess?	could I be precessing? could you be precessing? could she 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 she 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 she 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
couldn't I precess? couldn't you precess? couldn't she precess? couldn't we precess? couldn't you precess? couldn't they precess?	couldn't I be precessing? couldn't you be precessing? couldn't she be precessing? couldn't we be precessing? couldn't you be precessing? couldn't they be precessing?
Perfect	V-ing perfect
couldn't I have precessed? couldn't you have precessed? couldn't she have precessed? couldn't we have precessed? couldn't you have precessed? couldn't they have precessed?	couldn't I have been precessing? couldn't you have been precessing? couldn't she have been precessing? couldn't we have been precessing? couldn't you have been precessing? couldn't they have been precessing?