English verb conjugation
COULD SMUDGE

Regular verb: smudge - smudged - smudged

Affirmation

Simple form	V-ing form
I could smudge you could smudge she could smudge we could smudge you could smudge they could smudge	I could be smudging you could be smudging she could be smudging we could be smudging you could be smudging they could be smudging
Perfect	V-ing perfect
I could have smudged you could have smudged she could have smudged we could have smudged you could have smudged they could have smudged	I could have been smudging you could have been smudging she could have been smudging we could have been smudging you could have been smudging they could have been smudging

Negation

Simple form	V-ing form
I couldn't smudge you couldn't smudge she couldn't smudge we couldn't smudge you couldn't smudge they couldn't smudge	I couldn't be smudging you couldn't be smudging she couldn't be smudging we couldn't be smudging you couldn't be smudging they couldn't be smudging
Perfect	V-ing perfect
I couldn't have smudged you couldn't have smudged she couldn't have smudged we couldn't have smudged you couldn't have smudged they couldn't have smudged	I couldn't have been smudging you couldn't have been smudging she couldn't have been smudging we couldn't have been smudging you couldn't have been smudging they couldn't have been smudging

Interrogative form

Simple form	V-ing form
could I smudge? could you smudge? could she smudge? could we smudge? could you smudge? could they smudge?	could I be smudging? could you be smudging? could she be smudging? could we be smudging? could you be smudging? could they be smudging?
Perfect	V-ing perfect
could I have smudged? could you have smudged? could she have smudged? could we have smudged? could you have smudged? could they have smudged?	could I have been smudging? could you have been smudging? could she have been smudging? could we have been smudging? could you have been smudging? could they have been smudging?

Interro-negative form

Simple form	V-ing form
couldn't I smudge? couldn't you smudge? couldn't she smudge? couldn't we smudge? couldn't you smudge? couldn't they smudge?	couldn't I be smudging? couldn't you be smudging? couldn't she be smudging? couldn't we be smudging? couldn't you be smudging? couldn't they be smudging?
Perfect	V-ing perfect
couldn't I have smudged? couldn't you have smudged? couldn't she have smudged? couldn't we have smudged? couldn't you have smudged? couldn't they have smudged?	couldn't I have been smudging? couldn't you have been smudging? couldn't she have been smudging? couldn't we have been smudging? couldn't you have been smudging? couldn't they have been smudging?