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 could not wall you could not wall he could not wall we could not wall you could not wall they could not wall	I could not be walling you could not be walling he could not be walling we could not be walling you could not be walling they could not be walling
Perfect	V-ing perfect
I could not have walled you could not have walled he could not have walled we could not have walled you could not have walled they could not have walled	I could not have been walling you could not have been walling he could not have been walling we could not have been walling you could not have been walling they could not 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
could I not wall? could you not wall? could he not wall? could we not wall? could you not wall? could they not wall?	could I not be walling? could you not be walling? could he not be walling? could we not be walling? could you not be walling? could they not be walling?
Perfect	V-ing perfect
could I not have walled? could you not have walled? could he not have walled? could we not have walled? could you not have walled? could they not have walled?	could I not have been walling? could you not have been walling? could he not have been walling? could we not have been walling? could you not have been walling? could they not have been walling?