can smooth
Regular verb: smooth - smoothed- smoothed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can smooth
you can smooth
she can smooth
we can smooth
you can smooth
they can smooth 	I can be smoothing
you can be smoothing
she can be smoothing
we can be smoothing
you can be smoothing
they can be smoothing	I can have smoothed
you can have smoothed
she 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
she 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 	Perfect 	V-ing perfect 	
I cannot smooth
you cannot smooth
she cannot smooth
we cannot smooth
you cannot smooth
they cannot smooth 	I cannot be smoothing
you cannot be smoothing
she cannot be smoothing
we cannot be smoothing
you cannot be smoothing
they cannot be smoothing	I cannot have smoothed
you cannot have smoothed
she cannot have smoothed
we cannot have smoothed
you cannot have smoothed
they cannot have smoothed	I cannot have been smoothing
you cannot have been smoothing
she cannot have been smoothing
we cannot have been smoothing
you cannot have been smoothing
they cannot have been smoothing	

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