English verb conjugation
COULD DIG

Irregular verb: dig - dug - dug

Affirmation

Simple form	V-ing form
I could dig you could dig he could dig we could dig you could dig they could dig	I could be digging you could be digging he could be digging we could be digging you could be digging they could be digging
Perfect	V-ing perfect
I could have dug you could have dug he could have dug we could have dug you could have dug they could have dug	I could have been digging you could have been digging he could have been digging we could have been digging you could have been digging they could have been digging

Negation

Simple form	V-ing form
I could not dig you could not dig he could not dig we could not dig you could not dig they could not dig	I could not be digging you could not be digging he could not be digging we could not be digging you could not be digging they could not be digging
Perfect	V-ing perfect
I could not have dug you could not have dug he could not have dug we could not have dug you could not have dug they could not have dug	I could not have been digging you could not have been digging he could not have been digging we could not have been digging you could not have been digging they could not have been digging

Interrogative form

Simple form	V-ing form
could I dig? could you dig? could he dig? could we dig? could you dig? could they dig?	could I be digging? could you be digging? could he be digging? could we be digging? could you be digging? could they be digging?
Perfect	V-ing perfect
could I have dug? could you have dug? could he have dug? could we have dug? could you have dug? could they have dug?	could I have been digging? could you have been digging? could he have been digging? could we have been digging? could you have been digging? could they have been digging?

Interro-negative form

Simple form	V-ing form
could I not dig? could you not dig? could he not dig? could we not dig? could you not dig? could they not dig?	could I not be digging? could you not be digging? could he not be digging? could we not be digging? could you not be digging? could they not be digging?
Perfect	V-ing perfect
could I not have dug? could you not have dug? could he not have dug? could we not have dug? could you not have dug? could they not have dug?	could I not have been digging? could you not have been digging? could he not have been digging? could we not have been digging? could you not have been digging? could they not have been digging?