English verb conjugation
COULD SHADOWBOX

Regular verb: shadowbox - shadowboxed - shadowboxed

Affirmation

Simple form	V-ing form
I could shadowbox you could shadowbox he could shadowbox we could shadowbox you could shadowbox they could shadowbox	I could be shadowboxing you could be shadowboxing he could be shadowboxing we could be shadowboxing you could be shadowboxing they could be shadowboxing
Perfect	V-ing perfect
I could have shadowboxed you could have shadowboxed he could have shadowboxed we could have shadowboxed you could have shadowboxed they could have shadowboxed	I could have been shadowboxing you could have been shadowboxing he could have been shadowboxing we could have been shadowboxing you could have been shadowboxing they could have been shadowboxing

Negation

Simple form	V-ing form
I couldn't shadowbox you couldn't shadowbox he couldn't shadowbox we couldn't shadowbox you couldn't shadowbox they couldn't shadowbox	I couldn't be shadowboxing you couldn't be shadowboxing he couldn't be shadowboxing we couldn't be shadowboxing you couldn't be shadowboxing they couldn't be shadowboxing
Perfect	V-ing perfect
I couldn't have shadowboxed you couldn't have shadowboxed he couldn't have shadowboxed we couldn't have shadowboxed you couldn't have shadowboxed they couldn't have shadowboxed	I couldn't have been shadowboxing you couldn't have been shadowboxing he couldn't have been shadowboxing we couldn't have been shadowboxing you couldn't have been shadowboxing they couldn't have been shadowboxing

Interrogative form

Simple form	V-ing form
could I shadowbox? could you shadowbox? could he shadowbox? could we shadowbox? could you shadowbox? could they shadowbox?	could I be shadowboxing? could you be shadowboxing? could he be shadowboxing? could we be shadowboxing? could you be shadowboxing? could they be shadowboxing?
Perfect	V-ing perfect
could I have shadowboxed? could you have shadowboxed? could he have shadowboxed? could we have shadowboxed? could you have shadowboxed? could they have shadowboxed?	could I have been shadowboxing? could you have been shadowboxing? could he have been shadowboxing? could we have been shadowboxing? could you have been shadowboxing? could they have been shadowboxing?

Interro-negative form

Simple form	V-ing form
couldn't I shadowbox? couldn't you shadowbox? couldn't he shadowbox? couldn't we shadowbox? couldn't you shadowbox? couldn't they shadowbox?	couldn't I be shadowboxing? couldn't you be shadowboxing? couldn't he be shadowboxing? couldn't we be shadowboxing? couldn't you be shadowboxing? couldn't they be shadowboxing?
Perfect	V-ing perfect
couldn't I have shadowboxed? couldn't you have shadowboxed? couldn't he have shadowboxed? couldn't we have shadowboxed? couldn't you have shadowboxed? couldn't they have shadowboxed?	couldn't I have been shadowboxing? couldn't you have been shadowboxing? couldn't he have been shadowboxing? couldn't we have been shadowboxing? couldn't you have been shadowboxing? couldn't they have been shadowboxing?