English verb conjugation
COULD THREATEN

Regular verb: threaten - threatened - threatened

Affirmation

Simple form	V-ing form
I could threaten you could threaten he could threaten we could threaten you could threaten they could threaten	I could be threatening you could be threatening he could be threatening we could be threatening you could be threatening they could be threatening
Perfect	V-ing perfect
I could have threatened you could have threatened he could have threatened we could have threatened you could have threatened they could have threatened	I could have been threatening you could have been threatening he could have been threatening we could have been threatening you could have been threatening they could have been threatening

Negation

Simple form	V-ing form
I could not threaten you could not threaten he could not threaten we could not threaten you could not threaten they could not threaten	I could not be threatening you could not be threatening he could not be threatening we could not be threatening you could not be threatening they could not be threatening
Perfect	V-ing perfect
I could not have threatened you could not have threatened he could not have threatened we could not have threatened you could not have threatened they could not have threatened	I could not have been threatening you could not have been threatening he could not have been threatening we could not have been threatening you could not have been threatening they could not have been threatening

Interrogative form

Simple form	V-ing form
could I threaten? could you threaten? could he threaten? could we threaten? could you threaten? could they threaten?	could I be threatening? could you be threatening? could he be threatening? could we be threatening? could you be threatening? could they be threatening?
Perfect	V-ing perfect
could I have threatened? could you have threatened? could he have threatened? could we have threatened? could you have threatened? could they have threatened?	could I have been threatening? could you have been threatening? could he have been threatening? could we have been threatening? could you have been threatening? could they have been threatening?

Interro-negative form

Simple form	V-ing form
could I not threaten? could you not threaten? could he not threaten? could we not threaten? could you not threaten? could they not threaten?	could I not be threatening? could you not be threatening? could he not be threatening? could we not be threatening? could you not be threatening? could they not be threatening?
Perfect	V-ing perfect
could I not have threatened? could you not have threatened? could he not have threatened? could we not have threatened? could you not have threatened? could they not have threatened?	could I not have been threatening? could you not have been threatening? could he not have been threatening? could we not have been threatening? could you not have been threatening? could they not have been threatening?