English verb conjugation
MUST RETREAT

Regular verb: retreat - retreated - retreated

Affirmation

Simple form	V-ing form
I must retreat you must retreat she must retreat we must retreat you must retreat they must retreat	I must be retreating you must be retreating she must be retreating we must be retreating you must be retreating they must be retreating
Perfect	V-ing perfect
I must have retreated you must have retreated she must have retreated we must have retreated you must have retreated they must have retreated	I must have been retreating you must have been retreating she must have been retreating we must have been retreating you must have been retreating they must have been retreating

Negation

Simple form	V-ing form
I must not retreat you must not retreat she must not retreat we must not retreat you must not retreat they must not retreat	I must not be retreating you must not be retreating she must not be retreating we must not be retreating you must not be retreating they must not be retreating
Perfect	V-ing perfect
I must not have retreated you must not have retreated she must not have retreated we must not have retreated you must not have retreated they must not have retreated	I must not have been retreating you must not have been retreating she must not have been retreating we must not have been retreating you must not have been retreating they must not have been retreating

Interrogative form

Simple form	V-ing form
must I retreat? must you retreat? must she retreat? must we retreat? must you retreat? must they retreat?	must I be retreating? must you be retreating? must she be retreating? must we be retreating? must you be retreating? must they be retreating?
Perfect	V-ing perfect
must I have retreated? must you have retreated? must she have retreated? must we have retreated? must you have retreated? must they have retreated?	must I have been retreating? must you have been retreating? must she have been retreating? must we have been retreating? must you have been retreating? must they have been retreating?

Interro-negative form

Simple form	V-ing form
must I not retreat? must you not retreat? must she not retreat? must we not retreat? must you not retreat? must they not retreat?	must I not be retreating? must you not be retreating? must she not be retreating? must we not be retreating? must you not be retreating? must they not be retreating?
Perfect	V-ing perfect
must I not have retreated? must you not have retreated? must she not have retreated? must we not have retreated? must you not have retreated? must they not have retreated?	must I not have been retreating? must you not have been retreating? must she not have been retreating? must we not have been retreating? must you not have been retreating? must they not have been retreating?