I could package you could package he could package we could package you could package they could package
V-ing form
I could be packaging you could be packaging he could be packaging we could be packaging you could be packaging they could be packaging
Perfect
I could have packaged you could have packaged he could have packaged we could have packaged you could have packaged they could have packaged
V-ing perfect
I could have been packaging you could have been packaging he could have been packaging we could have been packaging you could have been packaging they could have been packaging
Negation
Simple form
I could not package you could not package he could not package we could not package you could not package they could not package
V-ing form
I could not be packaging you could not be packaging he could not be packaging we could not be packaging you could not be packaging they could not be packaging
Perfect
I could not have packaged you could not have packaged he could not have packaged we could not have packaged you could not have packaged they could not have packaged
V-ing perfect
I could not have been packaging you could not have been packaging he could not have been packaging we could not have been packaging you could not have been packaging they could not have been packaging
Interrogative form
Simple form
could I package? could you package? could he package? could we package? could you package? could they package?
V-ing form
could I be packaging? could you be packaging? could he be packaging? could we be packaging? could you be packaging? could they be packaging?
Perfect
could I have packaged? could you have packaged? could he have packaged? could we have packaged? could you have packaged? could they have packaged?
V-ing perfect
could I have been packaging? could you have been packaging? could he have been packaging? could we have been packaging? could you have been packaging? could they have been packaging?
Interro-negative form
Simple form
could I not package? could you not package? could he not package? could we not package? could you not package? could they not package?
V-ing form
could I not be packaging? could you not be packaging? could he not be packaging? could we not be packaging? could you not be packaging? could they not be packaging?
Perfect
could I not have packaged? could you not have packaged? could he not have packaged? could we not have packaged? could you not have packaged? could they not have packaged?
V-ing perfect
could I not have been packaging? could you not have been packaging? could he not have been packaging? could we not have been packaging? could you not have been packaging? could they not have been packaging?