must underrate
Regular verb: underrate - underrated- underrated

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

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

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

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