English verb conjugation
COULD WALK

Regular verb: walk - walked - walked

Affirmation

Simple form	V-ing form
I could walk you could walk she could walk we could walk you could walk they could walk	I could be walking you could be walking she could be walking we could be walking you could be walking they could be walking
Perfect	V-ing perfect
I could have walked you could have walked she could have walked we could have walked you could have walked they could have walked	I could have been walking you could have been walking she could have been walking we could have been walking you could have been walking they could have been walking

Negation

Simple form	V-ing form
I couldn't walk you couldn't walk she couldn't walk we couldn't walk you couldn't walk they couldn't walk	I couldn't be walking you couldn't be walking she couldn't be walking we couldn't be walking you couldn't be walking they couldn't be walking
Perfect	V-ing perfect
I couldn't have walked you couldn't have walked she couldn't have walked we couldn't have walked you couldn't have walked they couldn't have walked	I couldn't have been walking you couldn't have been walking she couldn't have been walking we couldn't have been walking you couldn't have been walking they couldn't have been walking

Interrogative form

Simple form	V-ing form
could I walk? could you walk? could she walk? could we walk? could you walk? could they walk?	could I be walking? could you be walking? could she be walking? could we be walking? could you be walking? could they be walking?
Perfect	V-ing perfect
could I have walked? could you have walked? could she have walked? could we have walked? could you have walked? could they have walked?	could I have been walking? could you have been walking? could she have been walking? could we have been walking? could you have been walking? could they have been walking?

Interro-negative form

Simple form	V-ing form
couldn't I walk? couldn't you walk? couldn't she walk? couldn't we walk? couldn't you walk? couldn't they walk?	couldn't I be walking? couldn't you be walking? couldn't she be walking? couldn't we be walking? couldn't you be walking? couldn't they be walking?
Perfect	V-ing perfect
couldn't I have walked? couldn't you have walked? couldn't she have walked? couldn't we have walked? couldn't you have walked? couldn't they have walked?	couldn't I have been walking? couldn't you have been walking? couldn't she have been walking? couldn't we have been walking? couldn't you have been walking? couldn't they have been walking?