could wall
Regular verb: wall - walled- walled

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