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 couldn't impoverish you couldn't impoverish she couldn't impoverish we couldn't impoverish you couldn't impoverish they couldn't impoverish
V-ing form
I couldn't be impoverishing you couldn't be impoverishing she couldn't be impoverishing we couldn't be impoverishing you couldn't be impoverishing they couldn't be impoverishing
Perfect
I couldn't have impoverished you couldn't have impoverished she couldn't have impoverished we couldn't have impoverished you couldn't have impoverished they couldn't have impoverished
V-ing perfect
I couldn't have been impoverishing you couldn't have been impoverishing she couldn't have been impoverishing we couldn't have been impoverishing you couldn't have been impoverishing they couldn't 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
couldn't I impoverish? couldn't you impoverish? couldn't she impoverish? couldn't we impoverish? couldn't you impoverish? couldn't they impoverish?
V-ing form
couldn't I be impoverishing? couldn't you be impoverishing? couldn't she be impoverishing? couldn't we be impoverishing? couldn't you be impoverishing? couldn't they be impoverishing?
Perfect
couldn't I have impoverished? couldn't you have impoverished? couldn't she have impoverished? couldn't we have impoverished? couldn't you have impoverished? couldn't they have impoverished?
V-ing perfect
couldn't I have been impoverishing? couldn't you have been impoverishing? couldn't she have been impoverishing? couldn't we have been impoverishing? couldn't you have been impoverishing? couldn't they have been impoverishing?