must retreat
Regular verb: retreat - retreated- retreated

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