must reobserve
Regular verb: reobserve - reobserved- reobserved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must reobserve
you must reobserve
he must reobserve
we must reobserve
you must reobserve
they must reobserve 	I must be reobserving
you must be reobserving
he must be reobserving
we must be reobserving
you must be reobserving
they must be reobserving	I must have reobserved
you must have reobserved
he must have reobserved
we must have reobserved
you must have reobserved
they must have reobserved	I must have been reobserving
you must have been reobserving
he must have been reobserving
we must have been reobserving
you must have been reobserving
they must have been reobserving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't reobserve
you mustn't reobserve
he mustn't reobserve
we mustn't reobserve
you mustn't reobserve
they mustn't reobserve 	I mustn't be reobserving
you mustn't be reobserving
he mustn't be reobserving
we mustn't be reobserving
you mustn't be reobserving
they mustn't be reobserving	I mustn't have reobserved
you mustn't have reobserved
he mustn't have reobserved
we mustn't have reobserved
you mustn't have reobserved
they mustn't have reobserved	I mustn't have been reobserving
you mustn't have been reobserving
he mustn't have been reobserving
we mustn't have been reobserving
you mustn't have been reobserving
they mustn't have been reobserving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I reobserve?
must you reobserve?
must he reobserve?
must we reobserve?
must you reobserve?
must they reobserve? 	must I be reobserving?
must you be reobserving?
must he be reobserving?
must we be reobserving?
must you be reobserving?
must they be reobserving? 	must I have reobserved?
must you have reobserved?
must he have reobserved?
must we have reobserved?
must you have reobserved?
must they have reobserved? 	must I have been reobserving?
must you have been reobserving?
must he have been reobserving?
must we have been reobserving?
must you have been reobserving?
must they have been reobserving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I reobserve?
mustn't you reobserve?
mustn't he reobserve?
mustn't we reobserve?
mustn't you reobserve?
mustn't they reobserve? 	mustn't I be reobserving?
mustn't you be reobserving?
mustn't he be reobserving?
mustn't we be reobserving?
mustn't you be reobserving?
mustn't they be reobserving? 	mustn't I have reobserved?
mustn't you have reobserved?
mustn't he have reobserved?
mustn't we have reobserved?
mustn't you have reobserved?
mustn't they have reobserved? 	mustn't I have been reobserving?
mustn't you have been reobserving?
mustn't he have been reobserving?
mustn't we have been reobserving?
mustn't you have been reobserving?
mustn't they have been reobserving?