I could short-change you could short-change he could short-change we could short-change you could short-change they could short-change
V-ing form
I could be short-changing you could be short-changing he could be short-changing we could be short-changing you could be short-changing they could be short-changing
Perfect
I could have short-changed you could have short-changed he could have short-changed we could have short-changed you could have short-changed they could have short-changed
V-ing perfect
I could have been short-changing you could have been short-changing he could have been short-changing we could have been short-changing you could have been short-changing they could have been short-changing
Negation
Simple form
I couldn't short-change you couldn't short-change he couldn't short-change we couldn't short-change you couldn't short-change they couldn't short-change
V-ing form
I couldn't be short-changing you couldn't be short-changing he couldn't be short-changing we couldn't be short-changing you couldn't be short-changing they couldn't be short-changing
Perfect
I couldn't have short-changed you couldn't have short-changed he couldn't have short-changed we couldn't have short-changed you couldn't have short-changed they couldn't have short-changed
V-ing perfect
I couldn't have been short-changing you couldn't have been short-changing he couldn't have been short-changing we couldn't have been short-changing you couldn't have been short-changing they couldn't have been short-changing
Interrogative form
Simple form
could I short-change? could you short-change? could he short-change? could we short-change? could you short-change? could they short-change?
V-ing form
could I be short-changing? could you be short-changing? could he be short-changing? could we be short-changing? could you be short-changing? could they be short-changing?
Perfect
could I have short-changed? could you have short-changed? could he have short-changed? could we have short-changed? could you have short-changed? could they have short-changed?
V-ing perfect
could I have been short-changing? could you have been short-changing? could he have been short-changing? could we have been short-changing? could you have been short-changing? could they have been short-changing?
Interro-negative form
Simple form
couldn't I short-change? couldn't you short-change? couldn't he short-change? couldn't we short-change? couldn't you short-change? couldn't they short-change?
V-ing form
couldn't I be short-changing? couldn't you be short-changing? couldn't he be short-changing? couldn't we be short-changing? couldn't you be short-changing? couldn't they be short-changing?
Perfect
couldn't I have short-changed? couldn't you have short-changed? couldn't he have short-changed? couldn't we have short-changed? couldn't you have short-changed? couldn't they have short-changed?
V-ing perfect
couldn't I have been short-changing? couldn't you have been short-changing? couldn't he have been short-changing? couldn't we have been short-changing? couldn't you have been short-changing? couldn't they have been short-changing?