English verb conjugation
COULD DIMINISH

Regular verb: diminish - diminished - diminished

Affirmation

Simple form	V-ing form
I could diminish you could diminish she could diminish we could diminish you could diminish they could diminish	I could be diminishing you could be diminishing she could be diminishing we could be diminishing you could be diminishing they could be diminishing
Perfect	V-ing perfect
I could have diminished you could have diminished she could have diminished we could have diminished you could have diminished they could have diminished	I could have been diminishing you could have been diminishing she could have been diminishing we could have been diminishing you could have been diminishing they could have been diminishing

Negation

Simple form	V-ing form
I couldn't diminish you couldn't diminish she couldn't diminish we couldn't diminish you couldn't diminish they couldn't diminish	I couldn't be diminishing you couldn't be diminishing she couldn't be diminishing we couldn't be diminishing you couldn't be diminishing they couldn't be diminishing
Perfect	V-ing perfect
I couldn't have diminished you couldn't have diminished she couldn't have diminished we couldn't have diminished you couldn't have diminished they couldn't have diminished	I couldn't have been diminishing you couldn't have been diminishing she couldn't have been diminishing we couldn't have been diminishing you couldn't have been diminishing they couldn't have been diminishing

Interrogative form

Simple form	V-ing form
could I diminish? could you diminish? could she diminish? could we diminish? could you diminish? could they diminish?	could I be diminishing? could you be diminishing? could she be diminishing? could we be diminishing? could you be diminishing? could they be diminishing?
Perfect	V-ing perfect
could I have diminished? could you have diminished? could she have diminished? could we have diminished? could you have diminished? could they have diminished?	could I have been diminishing? could you have been diminishing? could she have been diminishing? could we have been diminishing? could you have been diminishing? could they have been diminishing?

Interro-negative form

Simple form	V-ing form
couldn't I diminish? couldn't you diminish? couldn't she diminish? couldn't we diminish? couldn't you diminish? couldn't they diminish?	couldn't I be diminishing? couldn't you be diminishing? couldn't she be diminishing? couldn't we be diminishing? couldn't you be diminishing? couldn't they be diminishing?
Perfect	V-ing perfect
couldn't I have diminished? couldn't you have diminished? couldn't she have diminished? couldn't we have diminished? couldn't you have diminished? couldn't they have diminished?	couldn't I have been diminishing? couldn't you have been diminishing? couldn't she have been diminishing? couldn't we have been diminishing? couldn't you have been diminishing? couldn't they have been diminishing?