English verb conjugation
COULD WASH

Regular verb: wash - washed - washed

Affirmation

Simple form	V-ing form
I could wash you could wash she could wash we could wash you could wash they could wash	I could be washing you could be washing she could be washing we could be washing you could be washing they could be washing
Perfect	V-ing perfect
I could have washed you could have washed she could have washed we could have washed you could have washed they could have washed	I could have been washing you could have been washing she could have been washing we could have been washing you could have been washing they could have been washing

Negation

Simple form	V-ing form
I couldn't wash you couldn't wash she couldn't wash we couldn't wash you couldn't wash they couldn't wash	I couldn't be washing you couldn't be washing she couldn't be washing we couldn't be washing you couldn't be washing they couldn't be washing
Perfect	V-ing perfect
I couldn't have washed you couldn't have washed she couldn't have washed we couldn't have washed you couldn't have washed they couldn't have washed	I couldn't have been washing you couldn't have been washing she couldn't have been washing we couldn't have been washing you couldn't have been washing they couldn't have been washing

Interrogative form

Simple form	V-ing form
could I wash? could you wash? could she wash? could we wash? could you wash? could they wash?	could I be washing? could you be washing? could she be washing? could we be washing? could you be washing? could they be washing?
Perfect	V-ing perfect
could I have washed? could you have washed? could she have washed? could we have washed? could you have washed? could they have washed?	could I have been washing? could you have been washing? could she have been washing? could we have been washing? could you have been washing? could they have been washing?

Interro-negative form

Simple form	V-ing form
couldn't I wash? couldn't you wash? couldn't she wash? couldn't we wash? couldn't you wash? couldn't they wash?	couldn't I be washing? couldn't you be washing? couldn't she be washing? couldn't we be washing? couldn't you be washing? couldn't they be washing?
Perfect	V-ing perfect
couldn't I have washed? couldn't you have washed? couldn't she have washed? couldn't we have washed? couldn't you have washed? couldn't they have washed?	couldn't I have been washing? couldn't you have been washing? couldn't she have been washing? couldn't we have been washing? couldn't you have been washing? couldn't they have been washing?