must understate
Regular verb: understate - understated- understated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must understate
you must understate
she must understate
we must understate
you must understate
they must understate 	I must be understating
you must be understating
she must be understating
we must be understating
you must be understating
they must be understating	I must have understated
you must have understated
she must have understated
we must have understated
you must have understated
they must have understated	I must have been understating
you must have been understating
she must have been understating
we must have been understating
you must have been understating
they must have been understating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not understate
you must not understate
she must not understate
we must not understate
you must not understate
they must not understate 	I must not be understating
you must not be understating
she must not be understating
we must not be understating
you must not be understating
they must not be understating	I must not have understated
you must not have understated
she must not have understated
we must not have understated
you must not have understated
they must not have understated	I must not have been understating
you must not have been understating
she must not have been understating
we must not have been understating
you must not have been understating
they must not have been understating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I understate?
must you understate?
must she understate?
must we understate?
must you understate?
must they understate? 	must I be understating?
must you be understating?
must she be understating?
must we be understating?
must you be understating?
must they be understating? 	must I have understated?
must you have understated?
must she have understated?
must we have understated?
must you have understated?
must they have understated? 	must I have been understating?
must you have been understating?
must she have been understating?
must we have been understating?
must you have been understating?
must they have been understating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not understate?
must you not understate?
must she not understate?
must we not understate?
must you not understate?
must they not understate? 	must I not be understating?
must you not be understating?
must she not be understating?
must we not be understating?
must you not be understating?
must they not be understating? 	must I not have understated?
must you not have understated?
must she not have understated?
must we not have understated?
must you not have understated?
must they not have understated? 	must I not have been understating?
must you not have been understating?
must she not have been understating?
must we not have been understating?
must you not have been understating?
must they not have been understating?