English verb conjugation
SHOULD SMOOTHEN

Regular verb: smoothen - smoothened - smoothened

Affirmation

Simple form	V-ing form
I'd smoothen you'd smoothen he'd smoothen we'd smoothen you'd smoothen they'd smoothen	I'd be smoothening you'd be smoothening he'd be smoothening we'd be smoothening you'd be smoothening they'd be smoothening
Perfect	V-ing perfect
I should've smoothened you should've smoothened he should've smoothened we should've smoothened you should've smoothened they should've smoothened	I should've been smoothening you should've been smoothening he should've been smoothening we should've been smoothening you should've been smoothening they should've been smoothening

Negation

Simple form	V-ing form
I shouldn't smoothen you shouldn't smoothen he shouldn't smoothen we shouldn't smoothen you shouldn't smoothen they shouldn't smoothen	I shouldn't be smoothening you shouldn't be smoothening he shouldn't be smoothening we shouldn't be smoothening you shouldn't be smoothening they shouldn't be smoothening
Perfect	V-ing perfect
I shouldn't have smoothened you shouldn't have smoothened he shouldn't have smoothened we shouldn't have smoothened you shouldn't have smoothened they shouldn't have smoothened	I shouldn't have been smoothening you shouldn't have been smoothening he shouldn't have been smoothening we shouldn't have been smoothening you shouldn't have been smoothening they shouldn't have been smoothening

Interrogative form

Simple form	V-ing form
should I smoothen? should you smoothen? should he smoothen? should we smoothen? should you smoothen? should they smoothen?	should I be smoothening? should you be smoothening? should he be smoothening? should we be smoothening? should you be smoothening? should they be smoothening?
Perfect	V-ing perfect
should I have smoothened? should you have smoothened? should he have smoothened? should we have smoothened? should you have smoothened? should they have smoothened?	should I have been smoothening? should you have been smoothening? should he have been smoothening? should we have been smoothening? should you have been smoothening? should they have been smoothening?

Interro-negative form

Simple form	V-ing form
shouldn't I smoothen? shouldn't you smoothen? shouldn't he smoothen? shouldn't we smoothen? shouldn't you smoothen? shouldn't they smoothen?	shouldn't I be smoothening? shouldn't you be smoothening? shouldn't he be smoothening? shouldn't we be smoothening? shouldn't you be smoothening? shouldn't they be smoothening?
Perfect	V-ing perfect
shouldn't I have smoothened? shouldn't you have smoothened? shouldn't he have smoothened? shouldn't we have smoothened? shouldn't you have smoothened? shouldn't they have smoothened?	shouldn't I have been smoothening? shouldn't you have been smoothening? shouldn't he have been smoothening? shouldn't we have been smoothening? shouldn't you have been smoothening? shouldn't they have been smoothening?