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