I could dress you could dress he could dress we could dress you could dress they could dress
V-ing form
I could be dressing you could be dressing he could be dressing we could be dressing you could be dressing they could be dressing
Perfect
I could have dressed you could have dressed he could have dressed we could have dressed you could have dressed they could have dressed
V-ing perfect
I could have been dressing you could have been dressing he could have been dressing we could have been dressing you could have been dressing they could have been dressing
Negation
Simple form
I couldn't dress you couldn't dress he couldn't dress we couldn't dress you couldn't dress they couldn't dress
V-ing form
I couldn't be dressing you couldn't be dressing he couldn't be dressing we couldn't be dressing you couldn't be dressing they couldn't be dressing
Perfect
I couldn't have dressed you couldn't have dressed he couldn't have dressed we couldn't have dressed you couldn't have dressed they couldn't have dressed
V-ing perfect
I couldn't have been dressing you couldn't have been dressing he couldn't have been dressing we couldn't have been dressing you couldn't have been dressing they couldn't have been dressing
Interrogative form
Simple form
could I dress? could you dress? could he dress? could we dress? could you dress? could they dress?
V-ing form
could I be dressing? could you be dressing? could he be dressing? could we be dressing? could you be dressing? could they be dressing?
Perfect
could I have dressed? could you have dressed? could he have dressed? could we have dressed? could you have dressed? could they have dressed?
V-ing perfect
could I have been dressing? could you have been dressing? could he have been dressing? could we have been dressing? could you have been dressing? could they have been dressing?
Interro-negative form
Simple form
couldn't I dress? couldn't you dress? couldn't he dress? couldn't we dress? couldn't you dress? couldn't they dress?
V-ing form
couldn't I be dressing? couldn't you be dressing? couldn't he be dressing? couldn't we be dressing? couldn't you be dressing? couldn't they be dressing?
Perfect
couldn't I have dressed? couldn't you have dressed? couldn't he have dressed? couldn't we have dressed? couldn't you have dressed? couldn't they have dressed?
V-ing perfect
couldn't I have been dressing? couldn't you have been dressing? couldn't he have been dressing? couldn't we have been dressing? couldn't you have been dressing? couldn't they have been dressing?