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