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 couldn't underwithhold
you couldn't underwithhold
he couldn't underwithhold
we couldn't underwithhold
you couldn't underwithhold
they couldn't underwithhold 	I couldn't be underwithholding
you couldn't be underwithholding
he couldn't be underwithholding
we couldn't be underwithholding
you couldn't be underwithholding
they couldn't be underwithholding	I couldn't have underwithholded
you couldn't have underwithholded
he couldn't have underwithholded
we couldn't have underwithholded
you couldn't have underwithholded
they couldn't have underwithholded	I couldn't have been underwithholding
you couldn't have been underwithholding
he couldn't have been underwithholding
we couldn't have been underwithholding
you couldn't have been underwithholding
they couldn't 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 	
couldn't I underwithhold?
couldn't you underwithhold?
couldn't he underwithhold?
couldn't we underwithhold?
couldn't you underwithhold?
couldn't they underwithhold? 	couldn't I be underwithholding?
couldn't you be underwithholding?
couldn't he be underwithholding?
couldn't we be underwithholding?
couldn't you be underwithholding?
couldn't they be underwithholding? 	couldn't I have underwithholded?
couldn't you have underwithholded?
couldn't he have underwithholded?
couldn't we have underwithholded?
couldn't you have underwithholded?
couldn't they have underwithholded? 	couldn't I have been underwithholding?
couldn't you have been underwithholding?
couldn't he have been underwithholding?
couldn't we have been underwithholding?
couldn't you have been underwithholding?
couldn't they have been underwithholding?