English verb conjugation
MUST RETREAT

Regular verb: retreat - retreated - retreated

Affirmation

Simple form	V-ing form
I must retreat you must retreat he must retreat we must retreat you must retreat they must retreat	I must be retreating you must be retreating he 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 he 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 he 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 mustn't retreat you mustn't retreat he mustn't retreat we mustn't retreat you mustn't retreat they mustn't retreat	I mustn't be retreating you mustn't be retreating he mustn't be retreating we mustn't be retreating you mustn't be retreating they mustn't be retreating
Perfect	V-ing perfect
I mustn't have retreated you mustn't have retreated he mustn't have retreated we mustn't have retreated you mustn't have retreated they mustn't have retreated	I mustn't have been retreating you mustn't have been retreating he mustn't have been retreating we mustn't have been retreating you mustn't have been retreating they mustn't have been retreating

Interrogative form

Simple form	V-ing form
must I retreat? must you retreat? must he retreat? must we retreat? must you retreat? must they retreat?	must I be retreating? must you be retreating? must he 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 he 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 he 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
mustn't I retreat? mustn't you retreat? mustn't he retreat? mustn't we retreat? mustn't you retreat? mustn't they retreat?	mustn't I be retreating? mustn't you be retreating? mustn't he be retreating? mustn't we be retreating? mustn't you be retreating? mustn't they be retreating?
Perfect	V-ing perfect
mustn't I have retreated? mustn't you have retreated? mustn't he have retreated? mustn't we have retreated? mustn't you have retreated? mustn't they have retreated?	mustn't I have been retreating? mustn't you have been retreating? mustn't he have been retreating? mustn't we have been retreating? mustn't you have been retreating? mustn't they have been retreating?