English verb conjugation
COULD FOX

Regular verb: fox - foxed - foxed

Affirmation

Simple form	V-ing form
I could fox you could fox he could fox we could fox you could fox they could fox	I could be foxing you could be foxing he could be foxing we could be foxing you could be foxing they could be foxing
Perfect	V-ing perfect
I could have foxed you could have foxed he could have foxed we could have foxed you could have foxed they could have foxed	I could have been foxing you could have been foxing he could have been foxing we could have been foxing you could have been foxing they could have been foxing

Negation

Simple form	V-ing form
I couldn't fox you couldn't fox he couldn't fox we couldn't fox you couldn't fox they couldn't fox	I couldn't be foxing you couldn't be foxing he couldn't be foxing we couldn't be foxing you couldn't be foxing they couldn't be foxing
Perfect	V-ing perfect
I couldn't have foxed you couldn't have foxed he couldn't have foxed we couldn't have foxed you couldn't have foxed they couldn't have foxed	I couldn't have been foxing you couldn't have been foxing he couldn't have been foxing we couldn't have been foxing you couldn't have been foxing they couldn't have been foxing

Interrogative form

Simple form	V-ing form
could I fox? could you fox? could he fox? could we fox? could you fox? could they fox?	could I be foxing? could you be foxing? could he be foxing? could we be foxing? could you be foxing? could they be foxing?
Perfect	V-ing perfect
could I have foxed? could you have foxed? could he have foxed? could we have foxed? could you have foxed? could they have foxed?	could I have been foxing? could you have been foxing? could he have been foxing? could we have been foxing? could you have been foxing? could they have been foxing?

Interro-negative form

Simple form	V-ing form
couldn't I fox? couldn't you fox? couldn't he fox? couldn't we fox? couldn't you fox? couldn't they fox?	couldn't I be foxing? couldn't you be foxing? couldn't he be foxing? couldn't we be foxing? couldn't you be foxing? couldn't they be foxing?
Perfect	V-ing perfect
couldn't I have foxed? couldn't you have foxed? couldn't he have foxed? couldn't we have foxed? couldn't you have foxed? couldn't they have foxed?	couldn't I have been foxing? couldn't you have been foxing? couldn't he have been foxing? couldn't we have been foxing? couldn't you have been foxing? couldn't they have been foxing?