English verb conjugation
COULD WALL

Regular verb: wall - walled - walled

Affirmation

Simple form	V-ing form
I could wall you could wall he could wall we could wall you could wall they could wall	I could be walling you could be walling he could be walling we could be walling you could be walling they could be walling
Perfect	V-ing perfect
I could have walled you could have walled he could have walled we could have walled you could have walled they could have walled	I could have been walling you could have been walling he could have been walling we could have been walling you could have been walling they could have been walling

Negation

Simple form	V-ing form
I couldn't wall you couldn't wall he couldn't wall we couldn't wall you couldn't wall they couldn't wall	I couldn't be walling you couldn't be walling he couldn't be walling we couldn't be walling you couldn't be walling they couldn't be walling
Perfect	V-ing perfect
I couldn't have walled you couldn't have walled he couldn't have walled we couldn't have walled you couldn't have walled they couldn't have walled	I couldn't have been walling you couldn't have been walling he couldn't have been walling we couldn't have been walling you couldn't have been walling they couldn't have been walling

Interrogative form

Simple form	V-ing form
could I wall? could you wall? could he wall? could we wall? could you wall? could they wall?	could I be walling? could you be walling? could he be walling? could we be walling? could you be walling? could they be walling?
Perfect	V-ing perfect
could I have walled? could you have walled? could he have walled? could we have walled? could you have walled? could they have walled?	could I have been walling? could you have been walling? could he have been walling? could we have been walling? could you have been walling? could they have been walling?

Interro-negative form

Simple form	V-ing form
couldn't I wall? couldn't you wall? couldn't he wall? couldn't we wall? couldn't you wall? couldn't they wall?	couldn't I be walling? couldn't you be walling? couldn't he be walling? couldn't we be walling? couldn't you be walling? couldn't they be walling?
Perfect	V-ing perfect
couldn't I have walled? couldn't you have walled? couldn't he have walled? couldn't we have walled? couldn't you have walled? couldn't they have walled?	couldn't I have been walling? couldn't you have been walling? couldn't he have been walling? couldn't we have been walling? couldn't you have been walling? couldn't they have been walling?