must impoverish
Regular verb: impoverish - impoverished- impoverished

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must impoverish
you must impoverish
he must impoverish
we must impoverish
you must impoverish
they must impoverish 	I must be impoverishing
you must be impoverishing
he must be impoverishing
we must be impoverishing
you must be impoverishing
they must be impoverishing	I must have impoverished
you must have impoverished
he must have impoverished
we must have impoverished
you must have impoverished
they must have impoverished	I must have been impoverishing
you must have been impoverishing
he must have been impoverishing
we must have been impoverishing
you must have been impoverishing
they must have been impoverishing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't impoverish
you mustn't impoverish
he mustn't impoverish
we mustn't impoverish
you mustn't impoverish
they mustn't impoverish 	I mustn't be impoverishing
you mustn't be impoverishing
he mustn't be impoverishing
we mustn't be impoverishing
you mustn't be impoverishing
they mustn't be impoverishing	I mustn't have impoverished
you mustn't have impoverished
he mustn't have impoverished
we mustn't have impoverished
you mustn't have impoverished
they mustn't have impoverished	I mustn't have been impoverishing
you mustn't have been impoverishing
he mustn't have been impoverishing
we mustn't have been impoverishing
you mustn't have been impoverishing
they mustn't have been impoverishing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I impoverish?
must you impoverish?
must he impoverish?
must we impoverish?
must you impoverish?
must they impoverish? 	must I be impoverishing?
must you be impoverishing?
must he be impoverishing?
must we be impoverishing?
must you be impoverishing?
must they be impoverishing? 	must I have impoverished?
must you have impoverished?
must he have impoverished?
must we have impoverished?
must you have impoverished?
must they have impoverished? 	must I have been impoverishing?
must you have been impoverishing?
must he have been impoverishing?
must we have been impoverishing?
must you have been impoverishing?
must they have been impoverishing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I impoverish?
mustn't you impoverish?
mustn't he impoverish?
mustn't we impoverish?
mustn't you impoverish?
mustn't they impoverish? 	mustn't I be impoverishing?
mustn't you be impoverishing?
mustn't he be impoverishing?
mustn't we be impoverishing?
mustn't you be impoverishing?
mustn't they be impoverishing? 	mustn't I have impoverished?
mustn't you have impoverished?
mustn't he have impoverished?
mustn't we have impoverished?
mustn't you have impoverished?
mustn't they have impoverished? 	mustn't I have been impoverishing?
mustn't you have been impoverishing?
mustn't he have been impoverishing?
mustn't we have been impoverishing?
mustn't you have been impoverishing?
mustn't they have been impoverishing?