I could about-face you could about-face he could about-face we could about-face you could about-face they could about-face
V-ing form
I could be about-facing you could be about-facing he could be about-facing we could be about-facing you could be about-facing they could be about-facing
Perfect
I could have about-faced you could have about-faced he could have about-faced we could have about-faced you could have about-faced they could have about-faced
V-ing perfect
I could have been about-facing you could have been about-facing he could have been about-facing we could have been about-facing you could have been about-facing they could have been about-facing
Negation
Simple form
I couldn't about-face you couldn't about-face he couldn't about-face we couldn't about-face you couldn't about-face they couldn't about-face
V-ing form
I couldn't be about-facing you couldn't be about-facing he couldn't be about-facing we couldn't be about-facing you couldn't be about-facing they couldn't be about-facing
Perfect
I couldn't have about-faced you couldn't have about-faced he couldn't have about-faced we couldn't have about-faced you couldn't have about-faced they couldn't have about-faced
V-ing perfect
I couldn't have been about-facing you couldn't have been about-facing he couldn't have been about-facing we couldn't have been about-facing you couldn't have been about-facing they couldn't have been about-facing
Interrogative form
Simple form
could I about-face? could you about-face? could he about-face? could we about-face? could you about-face? could they about-face?
V-ing form
could I be about-facing? could you be about-facing? could he be about-facing? could we be about-facing? could you be about-facing? could they be about-facing?
Perfect
could I have about-faced? could you have about-faced? could he have about-faced? could we have about-faced? could you have about-faced? could they have about-faced?
V-ing perfect
could I have been about-facing? could you have been about-facing? could he have been about-facing? could we have been about-facing? could you have been about-facing? could they have been about-facing?
Interro-negative form
Simple form
couldn't I about-face? couldn't you about-face? couldn't he about-face? couldn't we about-face? couldn't you about-face? couldn't they about-face?
V-ing form
couldn't I be about-facing? couldn't you be about-facing? couldn't he be about-facing? couldn't we be about-facing? couldn't you be about-facing? couldn't they be about-facing?
Perfect
couldn't I have about-faced? couldn't you have about-faced? couldn't he have about-faced? couldn't we have about-faced? couldn't you have about-faced? couldn't they have about-faced?
V-ing perfect
couldn't I have been about-facing? couldn't you have been about-facing? couldn't he have been about-facing? couldn't we have been about-facing? couldn't you have been about-facing? couldn't they have been about-facing?