English verb conjugation
COULD OUTBOX

Regular verb: outbox - outboxed - outboxed

Affirmation

Simple form	V-ing form
I could outbox you could outbox he could outbox we could outbox you could outbox they could outbox	I could be outboxing you could be outboxing he could be outboxing we could be outboxing you could be outboxing they could be outboxing
Perfect	V-ing perfect
I could have outboxed you could have outboxed he could have outboxed we could have outboxed you could have outboxed they could have outboxed	I could have been outboxing you could have been outboxing he could have been outboxing we could have been outboxing you could have been outboxing they could have been outboxing

Negation

Simple form	V-ing form
I couldn't outbox you couldn't outbox he couldn't outbox we couldn't outbox you couldn't outbox they couldn't outbox	I couldn't be outboxing you couldn't be outboxing he couldn't be outboxing we couldn't be outboxing you couldn't be outboxing they couldn't be outboxing
Perfect	V-ing perfect
I couldn't have outboxed you couldn't have outboxed he couldn't have outboxed we couldn't have outboxed you couldn't have outboxed they couldn't have outboxed	I couldn't have been outboxing you couldn't have been outboxing he couldn't have been outboxing we couldn't have been outboxing you couldn't have been outboxing they couldn't have been outboxing

Interrogative form

Simple form	V-ing form
could I outbox? could you outbox? could he outbox? could we outbox? could you outbox? could they outbox?	could I be outboxing? could you be outboxing? could he be outboxing? could we be outboxing? could you be outboxing? could they be outboxing?
Perfect	V-ing perfect
could I have outboxed? could you have outboxed? could he have outboxed? could we have outboxed? could you have outboxed? could they have outboxed?	could I have been outboxing? could you have been outboxing? could he have been outboxing? could we have been outboxing? could you have been outboxing? could they have been outboxing?

Interro-negative form

Simple form	V-ing form
couldn't I outbox? couldn't you outbox? couldn't he outbox? couldn't we outbox? couldn't you outbox? couldn't they outbox?	couldn't I be outboxing? couldn't you be outboxing? couldn't he be outboxing? couldn't we be outboxing? couldn't you be outboxing? couldn't they be outboxing?
Perfect	V-ing perfect
couldn't I have outboxed? couldn't you have outboxed? couldn't he have outboxed? couldn't we have outboxed? couldn't you have outboxed? couldn't they have outboxed?	couldn't I have been outboxing? couldn't you have been outboxing? couldn't he have been outboxing? couldn't we have been outboxing? couldn't you have been outboxing? couldn't they have been outboxing?