could underrate
Regular verb: underrate - underrated- underrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could underrate
you could underrate
he could underrate
we could underrate
you could underrate
they could underrate 	I could be underrating
you could be underrating
he could be underrating
we could be underrating
you could be underrating
they could be underrating	I could have underrated
you could have underrated
he could have underrated
we could have underrated
you could have underrated
they could have underrated	I could have been underrating
you could have been underrating
he could have been underrating
we could have been underrating
you could have been underrating
they could have been underrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not underrate
you could not underrate
he could not underrate
we could not underrate
you could not underrate
they could not underrate 	I could not be underrating
you could not be underrating
he could not be underrating
we could not be underrating
you could not be underrating
they could not be underrating	I could not have underrated
you could not have underrated
he could not have underrated
we could not have underrated
you could not have underrated
they could not have underrated	I could not have been underrating
you could not have been underrating
he could not have been underrating
we could not have been underrating
you could not have been underrating
they could not have been underrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I underrate?
could you underrate?
could he underrate?
could we underrate?
could you underrate?
could they underrate? 	could I be underrating?
could you be underrating?
could he be underrating?
could we be underrating?
could you be underrating?
could they be underrating? 	could I have underrated?
could you have underrated?
could he have underrated?
could we have underrated?
could you have underrated?
could they have underrated? 	could I have been underrating?
could you have been underrating?
could he have been underrating?
could we have been underrating?
could you have been underrating?
could they have been underrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not underrate?
could you not underrate?
could he not underrate?
could we not underrate?
could you not underrate?
could they not underrate? 	could I not be underrating?
could you not be underrating?
could he not be underrating?
could we not be underrating?
could you not be underrating?
could they not be underrating? 	could I not have underrated?
could you not have underrated?
could he not have underrated?
could we not have underrated?
could you not have underrated?
could they not have underrated? 	could I not have been underrating?
could you not have been underrating?
could he not have been underrating?
could we not have been underrating?
could you not have been underrating?
could they not have been underrating?