English verb conjugation
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Regular verb: impoverish - impoverished - impoverished

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I must not impoverish you must not impoverish he must not impoverish we must not impoverish you must not impoverish they must not impoverish	I must not be impoverishing you must not be impoverishing he must not be impoverishing we must not be impoverishing you must not be impoverishing they must not be impoverishing
Perfect	V-ing perfect
I must not have impoverished you must not have impoverished he must not have impoverished we must not have impoverished you must not have impoverished they must not have impoverished	I must not have been impoverishing you must not have been impoverishing he must not have been impoverishing we must not have been impoverishing you must not have been impoverishing they must not have been impoverishing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
must I not impoverish? must you not impoverish? must he not impoverish? must we not impoverish? must you not impoverish? must they not impoverish?	must I not be impoverishing? must you not be impoverishing? must he not be impoverishing? must we not be impoverishing? must you not be impoverishing? must they not be impoverishing?
Perfect	V-ing perfect
must I not have impoverished? must you not have impoverished? must he not have impoverished? must we not have impoverished? must you not have impoverished? must they not have impoverished?	must I not have been impoverishing? must you not have been impoverishing? must he not have been impoverishing? must we not have been impoverishing? must you not have been impoverishing? must they not have been impoverishing?