I could ameliorate you could ameliorate she could ameliorate we could ameliorate you could ameliorate they could ameliorate
V-ing form
I could be ameliorating you could be ameliorating she could be ameliorating we could be ameliorating you could be ameliorating they could be ameliorating
Perfect
I could have ameliorated you could have ameliorated she could have ameliorated we could have ameliorated you could have ameliorated they could have ameliorated
V-ing perfect
I could have been ameliorating you could have been ameliorating she could have been ameliorating we could have been ameliorating you could have been ameliorating they could have been ameliorating
Negation
Simple form
I couldn't ameliorate you couldn't ameliorate she couldn't ameliorate we couldn't ameliorate you couldn't ameliorate they couldn't ameliorate
V-ing form
I couldn't be ameliorating you couldn't be ameliorating she couldn't be ameliorating we couldn't be ameliorating you couldn't be ameliorating they couldn't be ameliorating
Perfect
I couldn't have ameliorated you couldn't have ameliorated she couldn't have ameliorated we couldn't have ameliorated you couldn't have ameliorated they couldn't have ameliorated
V-ing perfect
I couldn't have been ameliorating you couldn't have been ameliorating she couldn't have been ameliorating we couldn't have been ameliorating you couldn't have been ameliorating they couldn't have been ameliorating
Interrogative form
Simple form
could I ameliorate? could you ameliorate? could she ameliorate? could we ameliorate? could you ameliorate? could they ameliorate?
V-ing form
could I be ameliorating? could you be ameliorating? could she be ameliorating? could we be ameliorating? could you be ameliorating? could they be ameliorating?
Perfect
could I have ameliorated? could you have ameliorated? could she have ameliorated? could we have ameliorated? could you have ameliorated? could they have ameliorated?
V-ing perfect
could I have been ameliorating? could you have been ameliorating? could she have been ameliorating? could we have been ameliorating? could you have been ameliorating? could they have been ameliorating?
Interro-negative form
Simple form
couldn't I ameliorate? couldn't you ameliorate? couldn't she ameliorate? couldn't we ameliorate? couldn't you ameliorate? couldn't they ameliorate?
V-ing form
couldn't I be ameliorating? couldn't you be ameliorating? couldn't she be ameliorating? couldn't we be ameliorating? couldn't you be ameliorating? couldn't they be ameliorating?
Perfect
couldn't I have ameliorated? couldn't you have ameliorated? couldn't she have ameliorated? couldn't we have ameliorated? couldn't you have ameliorated? couldn't they have ameliorated?
V-ing perfect
couldn't I have been ameliorating? couldn't you have been ameliorating? couldn't she have been ameliorating? couldn't we have been ameliorating? couldn't you have been ameliorating? couldn't they have been ameliorating?