English verb conjugation
MUST SMOOTH

Regular verb: smooth - smoothed - smoothed

Affirmation

Simple form	V-ing form
I must smooth you must smooth he must smooth we must smooth you must smooth they must smooth	I must be smoothing you must be smoothing he must be smoothing we must be smoothing you must be smoothing they must be smoothing
Perfect	V-ing perfect
I must have smoothed you must have smoothed he must have smoothed we must have smoothed you must have smoothed they must have smoothed	I must have been smoothing you must have been smoothing he must have been smoothing we must have been smoothing you must have been smoothing they must have been smoothing

Negation

Simple form	V-ing form
I must not smooth you must not smooth he must not smooth we must not smooth you must not smooth they must not smooth	I must not be smoothing you must not be smoothing he must not be smoothing we must not be smoothing you must not be smoothing they must not be smoothing
Perfect	V-ing perfect
I must not have smoothed you must not have smoothed he must not have smoothed we must not have smoothed you must not have smoothed they must not have smoothed	I must not have been smoothing you must not have been smoothing he must not have been smoothing we must not have been smoothing you must not have been smoothing they must not have been smoothing

Interrogative form

Simple form	V-ing form
must I smooth? must you smooth? must he smooth? must we smooth? must you smooth? must they smooth?	must I be smoothing? must you be smoothing? must he be smoothing? must we be smoothing? must you be smoothing? must they be smoothing?
Perfect	V-ing perfect
must I have smoothed? must you have smoothed? must he have smoothed? must we have smoothed? must you have smoothed? must they have smoothed?	must I have been smoothing? must you have been smoothing? must he have been smoothing? must we have been smoothing? must you have been smoothing? must they have been smoothing?

Interro-negative form

Simple form	V-ing form
must I not smooth? must you not smooth? must he not smooth? must we not smooth? must you not smooth? must they not smooth?	must I not be smoothing? must you not be smoothing? must he not be smoothing? must we not be smoothing? must you not be smoothing? must they not be smoothing?
Perfect	V-ing perfect
must I not have smoothed? must you not have smoothed? must he not have smoothed? must we not have smoothed? must you not have smoothed? must they not have smoothed?	must I not have been smoothing? must you not have been smoothing? must he not have been smoothing? must we not have been smoothing? must you not have been smoothing? must they not have been smoothing?