English verb conjugation
COULD PREINFORM

Regular verb: preinform - preinformed - preinformed

Affirmation

Simple form	V-ing form
I could preinform you could preinform he could preinform we could preinform you could preinform they could preinform	I could be preinforming you could be preinforming he could be preinforming we could be preinforming you could be preinforming they could be preinforming
Perfect	V-ing perfect
I could have preinformed you could have preinformed he could have preinformed we could have preinformed you could have preinformed they could have preinformed	I could have been preinforming you could have been preinforming he could have been preinforming we could have been preinforming you could have been preinforming they could have been preinforming

Negation

Simple form	V-ing form
I couldn't preinform you couldn't preinform he couldn't preinform we couldn't preinform you couldn't preinform they couldn't preinform	I couldn't be preinforming you couldn't be preinforming he couldn't be preinforming we couldn't be preinforming you couldn't be preinforming they couldn't be preinforming
Perfect	V-ing perfect
I couldn't have preinformed you couldn't have preinformed he couldn't have preinformed we couldn't have preinformed you couldn't have preinformed they couldn't have preinformed	I couldn't have been preinforming you couldn't have been preinforming he couldn't have been preinforming we couldn't have been preinforming you couldn't have been preinforming they couldn't have been preinforming

Interrogative form

Simple form	V-ing form
could I preinform? could you preinform? could he preinform? could we preinform? could you preinform? could they preinform?	could I be preinforming? could you be preinforming? could he be preinforming? could we be preinforming? could you be preinforming? could they be preinforming?
Perfect	V-ing perfect
could I have preinformed? could you have preinformed? could he have preinformed? could we have preinformed? could you have preinformed? could they have preinformed?	could I have been preinforming? could you have been preinforming? could he have been preinforming? could we have been preinforming? could you have been preinforming? could they have been preinforming?

Interro-negative form

Simple form	V-ing form
couldn't I preinform? couldn't you preinform? couldn't he preinform? couldn't we preinform? couldn't you preinform? couldn't they preinform?	couldn't I be preinforming? couldn't you be preinforming? couldn't he be preinforming? couldn't we be preinforming? couldn't you be preinforming? couldn't they be preinforming?
Perfect	V-ing perfect
couldn't I have preinformed? couldn't you have preinformed? couldn't he have preinformed? couldn't we have preinformed? couldn't you have preinformed? couldn't they have preinformed?	couldn't I have been preinforming? couldn't you have been preinforming? couldn't he have been preinforming? couldn't we have been preinforming? couldn't you have been preinforming? couldn't they have been preinforming?