could underwithhold
Regular verb: underwithhold - underwithholded- underwithholded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could underwithhold
you could underwithhold
he could underwithhold
we could underwithhold
you could underwithhold
they could underwithhold 	I could be underwithholding
you could be underwithholding
he could be underwithholding
we could be underwithholding
you could be underwithholding
they could be underwithholding	I could have underwithholded
you could have underwithholded
he could have underwithholded
we could have underwithholded
you could have underwithholded
they could have underwithholded	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 	V-ing form 	Perfect 	V-ing perfect 	
I could not underwithhold
you could not underwithhold
he could not underwithhold
we could not underwithhold
you could not underwithhold
they could not underwithhold 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
could I underwithhold?
could you underwithhold?
could he underwithhold?
could we underwithhold?
could you underwithhold?
could they underwithhold? 	could I be underwithholding?
could you be underwithholding?
could he be underwithholding?
could we be underwithholding?
could you be underwithholding?
could they be underwithholding? 	could I have underwithholded?
could you have underwithholded?
could he have underwithholded?
could we have underwithholded?
could you have underwithholded?
could they have underwithholded? 	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 	V-ing form 	Perfect 	V-ing perfect 	
could I not underwithhold?
could you not underwithhold?
could he not underwithhold?
could we not underwithhold?
could you not underwithhold?
could they not underwithhold? 	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? 	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? 	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?