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 couldn't smart you couldn't smart he couldn't smart we couldn't smart you couldn't smart they couldn't smart	I couldn't be smarting you couldn't be smarting he couldn't be smarting we couldn't be smarting you couldn't be smarting they couldn't be smarting
Perfect	V-ing perfect
I couldn't have smarted you couldn't have smarted he couldn't have smarted we couldn't have smarted you couldn't have smarted they couldn't have smarted	I couldn't have been smarting you couldn't have been smarting he couldn't have been smarting we couldn't have been smarting you couldn't have been smarting they couldn't 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
couldn't I smart? couldn't you smart? couldn't he smart? couldn't we smart? couldn't you smart? couldn't they smart?	couldn't I be smarting? couldn't you be smarting? couldn't he be smarting? couldn't we be smarting? couldn't you be smarting? couldn't they be smarting?
Perfect	V-ing perfect
couldn't I have smarted? couldn't you have smarted? couldn't he have smarted? couldn't we have smarted? couldn't you have smarted? couldn't they have smarted?	couldn't I have been smarting? couldn't you have been smarting? couldn't he have been smarting? couldn't we have been smarting? couldn't you have been smarting? couldn't they have been smarting?