must overinvest
Regular verb: overinvest - overinvested- overinvested

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must overinvest
you must overinvest
he must overinvest
we must overinvest
you must overinvest
they must overinvest 	I must be overinvesting
you must be overinvesting
he must be overinvesting
we must be overinvesting
you must be overinvesting
they must be overinvesting	I must have overinvested
you must have overinvested
he must have overinvested
we must have overinvested
you must have overinvested
they must have overinvested	I must have been overinvesting
you must have been overinvesting
he must have been overinvesting
we must have been overinvesting
you must have been overinvesting
they must have been overinvesting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't overinvest
you mustn't overinvest
he mustn't overinvest
we mustn't overinvest
you mustn't overinvest
they mustn't overinvest 	I mustn't be overinvesting
you mustn't be overinvesting
he mustn't be overinvesting
we mustn't be overinvesting
you mustn't be overinvesting
they mustn't be overinvesting	I mustn't have overinvested
you mustn't have overinvested
he mustn't have overinvested
we mustn't have overinvested
you mustn't have overinvested
they mustn't have overinvested	I mustn't have been overinvesting
you mustn't have been overinvesting
he mustn't have been overinvesting
we mustn't have been overinvesting
you mustn't have been overinvesting
they mustn't have been overinvesting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I overinvest?
must you overinvest?
must he overinvest?
must we overinvest?
must you overinvest?
must they overinvest? 	must I be overinvesting?
must you be overinvesting?
must he be overinvesting?
must we be overinvesting?
must you be overinvesting?
must they be overinvesting? 	must I have overinvested?
must you have overinvested?
must he have overinvested?
must we have overinvested?
must you have overinvested?
must they have overinvested? 	must I have been overinvesting?
must you have been overinvesting?
must he have been overinvesting?
must we have been overinvesting?
must you have been overinvesting?
must they have been overinvesting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I overinvest?
mustn't you overinvest?
mustn't he overinvest?
mustn't we overinvest?
mustn't you overinvest?
mustn't they overinvest? 	mustn't I be overinvesting?
mustn't you be overinvesting?
mustn't he be overinvesting?
mustn't we be overinvesting?
mustn't you be overinvesting?
mustn't they be overinvesting? 	mustn't I have overinvested?
mustn't you have overinvested?
mustn't he have overinvested?
mustn't we have overinvested?
mustn't you have overinvested?
mustn't they have overinvested? 	mustn't I have been overinvesting?
mustn't you have been overinvesting?
mustn't he have been overinvesting?
mustn't we have been overinvesting?
mustn't you have been overinvesting?
mustn't they have been overinvesting?