English verb conjugation
SHOULD KNUCKLE

Regular verb: knuckle - knuckled - knuckled

Affirmation

Simple form	V-ing form
I should knuckle you should knuckle he should knuckle we should knuckle you should knuckle they should knuckle	I should be knuckling you should be knuckling he should be knuckling we should be knuckling you should be knuckling they should be knuckling
Perfect	V-ing perfect
I should have knuckled you should have knuckled he should have knuckled we should have knuckled you should have knuckled they should have knuckled	I should have been knuckling you should have been knuckling he should have been knuckling we should have been knuckling you should have been knuckling they should have been knuckling

Negation

Simple form	V-ing form
I should not knuckle you should not knuckle he should not knuckle we should not knuckle you should not knuckle they should not knuckle	I should not be knuckling you should not be knuckling he should not be knuckling we should not be knuckling you should not be knuckling they should not be knuckling
Perfect	V-ing perfect
I should not have knuckled you should not have knuckled he should not have knuckled we should not have knuckled you should not have knuckled they should not have knuckled	I should not have been knuckling you should not have been knuckling he should not have been knuckling we should not have been knuckling you should not have been knuckling they should not have been knuckling

Interrogative form

Simple form	V-ing form
should I knuckle? should you knuckle? should he knuckle? should we knuckle? should you knuckle? should they knuckle?	should I be knuckling? should you be knuckling? should he be knuckling? should we be knuckling? should you be knuckling? should they be knuckling?
Perfect	V-ing perfect
should I have knuckled? should you have knuckled? should he have knuckled? should we have knuckled? should you have knuckled? should they have knuckled?	should I have been knuckling? should you have been knuckling? should he have been knuckling? should we have been knuckling? should you have been knuckling? should they have been knuckling?

Interro-negative form

Simple form	V-ing form
should I not knuckle? should you not knuckle? should he not knuckle? should we not knuckle? should you not knuckle? should they not knuckle?	should I not be knuckling? should you not be knuckling? should he not be knuckling? should we not be knuckling? should you not be knuckling? should they not be knuckling?
Perfect	V-ing perfect
should I not have knuckled? should you not have knuckled? should he not have knuckled? should we not have knuckled? should you not have knuckled? should they not have knuckled?	should I not have been knuckling? should you not have been knuckling? should he not have been knuckling? should we not have been knuckling? should you not have been knuckling? should they not have been knuckling?