English verb conjugation
MUST DIG

Irregular verb: dig - dug - dug

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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