English verb conjugation
COULD DEFOG

Regular verb: defog - defoged - defoged

Affirmation

Simple form	V-ing form
I could defog you could defog she could defog we could defog you could defog they could defog	I could be defoging you could be defoging she could be defoging we could be defoging you could be defoging they could be defoging
Perfect	V-ing perfect
I could have defoged you could have defoged she could have defoged we could have defoged you could have defoged they could have defoged	I could have been defoging you could have been defoging she could have been defoging we could have been defoging you could have been defoging they could have been defoging

Negation

Simple form	V-ing form
I couldn't defog you couldn't defog she couldn't defog we couldn't defog you couldn't defog they couldn't defog	I couldn't be defoging you couldn't be defoging she couldn't be defoging we couldn't be defoging you couldn't be defoging they couldn't be defoging
Perfect	V-ing perfect
I couldn't have defoged you couldn't have defoged she couldn't have defoged we couldn't have defoged you couldn't have defoged they couldn't have defoged	I couldn't have been defoging you couldn't have been defoging she couldn't have been defoging we couldn't have been defoging you couldn't have been defoging they couldn't have been defoging

Interrogative form

Simple form	V-ing form
could I defog? could you defog? could she defog? could we defog? could you defog? could they defog?	could I be defoging? could you be defoging? could she be defoging? could we be defoging? could you be defoging? could they be defoging?
Perfect	V-ing perfect
could I have defoged? could you have defoged? could she have defoged? could we have defoged? could you have defoged? could they have defoged?	could I have been defoging? could you have been defoging? could she have been defoging? could we have been defoging? could you have been defoging? could they have been defoging?

Interro-negative form

Simple form	V-ing form
couldn't I defog? couldn't you defog? couldn't she defog? couldn't we defog? couldn't you defog? couldn't they defog?	couldn't I be defoging? couldn't you be defoging? couldn't she be defoging? couldn't we be defoging? couldn't you be defoging? couldn't they be defoging?
Perfect	V-ing perfect
couldn't I have defoged? couldn't you have defoged? couldn't she have defoged? couldn't we have defoged? couldn't you have defoged? couldn't they have defoged?	couldn't I have been defoging? couldn't you have been defoging? couldn't she have been defoging? couldn't we have been defoging? couldn't you have been defoging? couldn't they have been defoging?