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