English verb conjugation
MUST SMOOTHEN

Regular verb: smoothen - smoothened - smoothened

Affirmation

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

Negation

Simple form	V-ing form
I must not smoothen you must not smoothen he must not smoothen we must not smoothen you must not smoothen they must not smoothen	I must not be smoothening you must not be smoothening he must not be smoothening we must not be smoothening you must not be smoothening they must not be smoothening
Perfect	V-ing perfect
I must not have smoothened you must not have smoothened he must not have smoothened we must not have smoothened you must not have smoothened they must not have smoothened	I must not have been smoothening you must not have been smoothening he must not have been smoothening we must not have been smoothening you must not have been smoothening they must not have been smoothening

Interrogative form

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

Interro-negative form

Simple form	V-ing form
must I not smoothen? must you not smoothen? must he not smoothen? must we not smoothen? must you not smoothen? must they not smoothen?	must I not be smoothening? must you not be smoothening? must he not be smoothening? must we not be smoothening? must you not be smoothening? must they not be smoothening?
Perfect	V-ing perfect
must I not have smoothened? must you not have smoothened? must he not have smoothened? must we not have smoothened? must you not have smoothened? must they not have smoothened?	must I not have been smoothening? must you not have been smoothening? must he not have been smoothening? must we not have been smoothening? must you not have been smoothening? must they not have been smoothening?