English verb conjugation
COULD SMART

Regular verb: smart - smarted - smarted

Affirmation

Simple form	V-ing form
I could smart you could smart he could smart we could smart you could smart they could smart	I could be smarting you could be smarting he could be smarting we could be smarting you could be smarting they could be smarting
Perfect	V-ing perfect
I could have smarted you could have smarted he could have smarted we could have smarted you could have smarted they could have smarted	I could have been smarting you could have been smarting he could have been smarting we could have been smarting you could have been smarting they could have been smarting

Negation

Simple form	V-ing form
I could not smart you could not smart he could not smart we could not smart you could not smart they could not smart	I could not be smarting you could not be smarting he could not be smarting we could not be smarting you could not be smarting they could not be smarting
Perfect	V-ing perfect
I could not have smarted you could not have smarted he could not have smarted we could not have smarted you could not have smarted they could not have smarted	I could not have been smarting you could not have been smarting he could not have been smarting we could not have been smarting you could not have been smarting they could not have been smarting

Interrogative form

Simple form	V-ing form
could I smart? could you smart? could he smart? could we smart? could you smart? could they smart?	could I be smarting? could you be smarting? could he be smarting? could we be smarting? could you be smarting? could they be smarting?
Perfect	V-ing perfect
could I have smarted? could you have smarted? could he have smarted? could we have smarted? could you have smarted? could they have smarted?	could I have been smarting? could you have been smarting? could he have been smarting? could we have been smarting? could you have been smarting? could they have been smarting?

Interro-negative form

Simple form	V-ing form
could I not smart? could you not smart? could he not smart? could we not smart? could you not smart? could they not smart?	could I not be smarting? could you not be smarting? could he not be smarting? could we not be smarting? could you not be smarting? could they not be smarting?
Perfect	V-ing perfect
could I not have smarted? could you not have smarted? could he not have smarted? could we not have smarted? could you not have smarted? could they not have smarted?	could I not have been smarting? could you not have been smarting? could he not have been smarting? could we not have been smarting? could you not have been smarting? could they not have been smarting?