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