could preinform
Regular verb: preinform - preinformed- preinformed

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