I could impoverish you could impoverish she could impoverish we could impoverish you could impoverish they could impoverish
V-ing form
I could be impoverishing you could be impoverishing she could be impoverishing we could be impoverishing you could be impoverishing they could be impoverishing
Perfect
I could have impoverished you could have impoverished she could have impoverished we could have impoverished you could have impoverished they could have impoverished
V-ing perfect
I could have been impoverishing you could have been impoverishing she could have been impoverishing we could have been impoverishing you could have been impoverishing they could have been impoverishing
Negation
Simple form
I could not impoverish you could not impoverish she could not impoverish we could not impoverish you could not impoverish they could not impoverish
V-ing form
I could not be impoverishing you could not be impoverishing she could not be impoverishing we could not be impoverishing you could not be impoverishing they could not be impoverishing
Perfect
I could not have impoverished you could not have impoverished she could not have impoverished we could not have impoverished you could not have impoverished they could not have impoverished
V-ing perfect
I could not have been impoverishing you could not have been impoverishing she could not have been impoverishing we could not have been impoverishing you could not have been impoverishing they could not have been impoverishing
Interrogative form
Simple form
could I impoverish? could you impoverish? could she impoverish? could we impoverish? could you impoverish? could they impoverish?
V-ing form
could I be impoverishing? could you be impoverishing? could she be impoverishing? could we be impoverishing? could you be impoverishing? could they be impoverishing?
Perfect
could I have impoverished? could you have impoverished? could she have impoverished? could we have impoverished? could you have impoverished? could they have impoverished?
V-ing perfect
could I have been impoverishing? could you have been impoverishing? could she have been impoverishing? could we have been impoverishing? could you have been impoverishing? could they have been impoverishing?
Interro-negative form
Simple form
could I not impoverish? could you not impoverish? could she not impoverish? could we not impoverish? could you not impoverish? could they not impoverish?
V-ing form
could I not be impoverishing? could you not be impoverishing? could she not be impoverishing? could we not be impoverishing? could you not be impoverishing? could they not be impoverishing?
Perfect
could I not have impoverished? could you not have impoverished? could she not have impoverished? could we not have impoverished? could you not have impoverished? could they not have impoverished?
V-ing perfect
could I not have been impoverishing? could you not have been impoverishing? could she not have been impoverishing? could we not have been impoverishing? could you not have been impoverishing? could they not have been impoverishing?