English verb conjugation
CAN PRECESS

Regular verb: precess - precessed - precessed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I can't precess you can't precess he can't precess we can't precess you can't precess they can't precess	I can't be precessing you can't be precessing he can't be precessing we can't be precessing you can't be precessing they can't be precessing
Perfect	V-ing perfect
I can't have precessed you can't have precessed he can't have precessed we can't have precessed you can't have precessed they can't have precessed	I can't have been precessing you can't have been precessing he can't have been precessing we can't have been precessing you can't have been precessing they can't have been precessing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

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