English verb conjugation
COULD SMOOTH

Regular verb: smooth - smoothed - smoothed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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