English verb conjugation
COULD DIG

Irregular verb: dig - dug - dug

Affirmation

Simple form	V-ing form
I could dig you could dig she could dig we could dig you could dig they could dig	I could be digging you could be digging she 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 she 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 she 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 she 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 she 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 she 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 she 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 she dig? could we dig? could you dig? could they dig?	could I be digging? could you be digging? could she 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 she 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 she 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 she 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 she 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 she 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 she not have been digging? could we not have been digging? could you not have been digging? could they not have been digging?