English verb conjugation
SHOULD THREATEN

Regular verb: threaten - threatened - threatened

Affirmation

Simple form	V-ing form
I'd threaten you'd threaten he'd threaten we'd threaten you'd threaten they'd threaten	I'd be threatening you'd be threatening he'd be threatening we'd be threatening you'd be threatening they'd be threatening
Perfect	V-ing perfect
I should've threatened you should've threatened he should've threatened we should've threatened you should've threatened they should've threatened	I should've been threatening you should've been threatening he should've been threatening we should've been threatening you should've been threatening they should've been threatening

Negation

Simple form	V-ing form
I shouldn't threaten you shouldn't threaten he shouldn't threaten we shouldn't threaten you shouldn't threaten they shouldn't threaten	I shouldn't be threatening you shouldn't be threatening he shouldn't be threatening we shouldn't be threatening you shouldn't be threatening they shouldn't be threatening
Perfect	V-ing perfect
I shouldn't have threatened you shouldn't have threatened he shouldn't have threatened we shouldn't have threatened you shouldn't have threatened they shouldn't have threatened	I shouldn't have been threatening you shouldn't have been threatening he shouldn't have been threatening we shouldn't have been threatening you shouldn't have been threatening they shouldn't have been threatening

Interrogative form

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

Interro-negative form

Simple form	V-ing form
shouldn't I threaten? shouldn't you threaten? shouldn't he threaten? shouldn't we threaten? shouldn't you threaten? shouldn't they threaten?	shouldn't I be threatening? shouldn't you be threatening? shouldn't he be threatening? shouldn't we be threatening? shouldn't you be threatening? shouldn't they be threatening?
Perfect	V-ing perfect
shouldn't I have threatened? shouldn't you have threatened? shouldn't he have threatened? shouldn't we have threatened? shouldn't you have threatened? shouldn't they have threatened?	shouldn't I have been threatening? shouldn't you have been threatening? shouldn't he have been threatening? shouldn't we have been threatening? shouldn't you have been threatening? shouldn't they have been threatening?