English verb conjugation
CAN SMOOTH

Regular verb: smooth - smoothed - smoothed

Affirmation

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

Negation

Simple form	V-ing form
I can't smooth you can't smooth he can't smooth we can't smooth you can't smooth they can't smooth	I can't be smoothing you can't be smoothing he can't be smoothing we can't be smoothing you can't be smoothing they can't be smoothing
Perfect	V-ing perfect
I can't have smoothed you can't have smoothed he can't have smoothed we can't have smoothed you can't have smoothed they can't have smoothed	I can't have been smoothing you can't have been smoothing he can't have been smoothing we can't have been smoothing you can't have been smoothing they can't have been smoothing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I smooth? can't you smooth? can't he smooth? can't we smooth? can't you smooth? can't they smooth?	can't I be smoothing? can't you be smoothing? can't he be smoothing? can't we be smoothing? can't you be smoothing? can't they be smoothing?
Perfect	V-ing perfect
can't I have smoothed? can't you have smoothed? can't he have smoothed? can't we have smoothed? can't you have smoothed? can't they have smoothed?	can't I have been smoothing? can't you have been smoothing? can't he have been smoothing? can't we have been smoothing? can't you have been smoothing? can't they have been smoothing?