I could underwithhold you could underwithhold he could underwithhold we could underwithhold you could underwithhold they could underwithhold
V-ing form
I could be underwithholding you could be underwithholding he could be underwithholding we could be underwithholding you could be underwithholding they could be underwithholding
Perfect
I could have underwithholded you could have underwithholded he could have underwithholded we could have underwithholded you could have underwithholded they could have underwithholded
V-ing perfect
I could have been underwithholding you could have been underwithholding he could have been underwithholding we could have been underwithholding you could have been underwithholding they could have been underwithholding
Negation
Simple form
I could not underwithhold you could not underwithhold he could not underwithhold we could not underwithhold you could not underwithhold they could not underwithhold
V-ing form
I could not be underwithholding you could not be underwithholding he could not be underwithholding we could not be underwithholding you could not be underwithholding they could not be underwithholding
Perfect
I could not have underwithholded you could not have underwithholded he could not have underwithholded we could not have underwithholded you could not have underwithholded they could not have underwithholded
V-ing perfect
I could not have been underwithholding you could not have been underwithholding he could not have been underwithholding we could not have been underwithholding you could not have been underwithholding they could not have been underwithholding
Interrogative form
Simple form
could I underwithhold? could you underwithhold? could he underwithhold? could we underwithhold? could you underwithhold? could they underwithhold?
V-ing form
could I be underwithholding? could you be underwithholding? could he be underwithholding? could we be underwithholding? could you be underwithholding? could they be underwithholding?
Perfect
could I have underwithholded? could you have underwithholded? could he have underwithholded? could we have underwithholded? could you have underwithholded? could they have underwithholded?
V-ing perfect
could I have been underwithholding? could you have been underwithholding? could he have been underwithholding? could we have been underwithholding? could you have been underwithholding? could they have been underwithholding?
Interro-negative form
Simple form
could I not underwithhold? could you not underwithhold? could he not underwithhold? could we not underwithhold? could you not underwithhold? could they not underwithhold?
V-ing form
could I not be underwithholding? could you not be underwithholding? could he not be underwithholding? could we not be underwithholding? could you not be underwithholding? could they not be underwithholding?
Perfect
could I not have underwithholded? could you not have underwithholded? could he not have underwithholded? could we not have underwithholded? could you not have underwithholded? could they not have underwithholded?
V-ing perfect
could I not have been underwithholding? could you not have been underwithholding? could he not have been underwithholding? could we not have been underwithholding? could you not have been underwithholding? could they not have been underwithholding?