I could spare you could spare he could spare we could spare you could spare they could spare
V-ing form
I could be sparing you could be sparing he could be sparing we could be sparing you could be sparing they could be sparing
Perfect
I could have spared you could have spared he could have spared we could have spared you could have spared they could have spared
V-ing perfect
I could have been sparing you could have been sparing he could have been sparing we could have been sparing you could have been sparing they could have been sparing
Negation
Simple form
I could not spare you could not spare he could not spare we could not spare you could not spare they could not spare
V-ing form
I could not be sparing you could not be sparing he could not be sparing we could not be sparing you could not be sparing they could not be sparing
Perfect
I could not have spared you could not have spared he could not have spared we could not have spared you could not have spared they could not have spared
V-ing perfect
I could not have been sparing you could not have been sparing he could not have been sparing we could not have been sparing you could not have been sparing they could not have been sparing
Interrogative form
Simple form
could I spare? could you spare? could he spare? could we spare? could you spare? could they spare?
V-ing form
could I be sparing? could you be sparing? could he be sparing? could we be sparing? could you be sparing? could they be sparing?
Perfect
could I have spared? could you have spared? could he have spared? could we have spared? could you have spared? could they have spared?
V-ing perfect
could I have been sparing? could you have been sparing? could he have been sparing? could we have been sparing? could you have been sparing? could they have been sparing?
Interro-negative form
Simple form
could I not spare? could you not spare? could he not spare? could we not spare? could you not spare? could they not spare?
V-ing form
could I not be sparing? could you not be sparing? could he not be sparing? could we not be sparing? could you not be sparing? could they not be sparing?
Perfect
could I not have spared? could you not have spared? could he not have spared? could we not have spared? could you not have spared? could they not have spared?
V-ing perfect
could I not have been sparing? could you not have been sparing? could he not have been sparing? could we not have been sparing? could you not have been sparing? could they not have been sparing?