must attenuate
Regular verb: attenuate - attenuated- attenuated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must attenuate
you must attenuate
he must attenuate
we must attenuate
you must attenuate
they must attenuate 	I must be attenuating
you must be attenuating
he must be attenuating
we must be attenuating
you must be attenuating
they must be attenuating	I must have attenuated
you must have attenuated
he must have attenuated
we must have attenuated
you must have attenuated
they must have attenuated	I must have been attenuating
you must have been attenuating
he must have been attenuating
we must have been attenuating
you must have been attenuating
they must have been attenuating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't attenuate
you mustn't attenuate
he mustn't attenuate
we mustn't attenuate
you mustn't attenuate
they mustn't attenuate 	I mustn't be attenuating
you mustn't be attenuating
he mustn't be attenuating
we mustn't be attenuating
you mustn't be attenuating
they mustn't be attenuating	I mustn't have attenuated
you mustn't have attenuated
he mustn't have attenuated
we mustn't have attenuated
you mustn't have attenuated
they mustn't have attenuated	I mustn't have been attenuating
you mustn't have been attenuating
he mustn't have been attenuating
we mustn't have been attenuating
you mustn't have been attenuating
they mustn't have been attenuating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I attenuate?
must you attenuate?
must he attenuate?
must we attenuate?
must you attenuate?
must they attenuate? 	must I be attenuating?
must you be attenuating?
must he be attenuating?
must we be attenuating?
must you be attenuating?
must they be attenuating? 	must I have attenuated?
must you have attenuated?
must he have attenuated?
must we have attenuated?
must you have attenuated?
must they have attenuated? 	must I have been attenuating?
must you have been attenuating?
must he have been attenuating?
must we have been attenuating?
must you have been attenuating?
must they have been attenuating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I attenuate?
mustn't you attenuate?
mustn't he attenuate?
mustn't we attenuate?
mustn't you attenuate?
mustn't they attenuate? 	mustn't I be attenuating?
mustn't you be attenuating?
mustn't he be attenuating?
mustn't we be attenuating?
mustn't you be attenuating?
mustn't they be attenuating? 	mustn't I have attenuated?
mustn't you have attenuated?
mustn't he have attenuated?
mustn't we have attenuated?
mustn't you have attenuated?
mustn't they have attenuated? 	mustn't I have been attenuating?
mustn't you have been attenuating?
mustn't he have been attenuating?
mustn't we have been attenuating?
mustn't you have been attenuating?
mustn't they have been attenuating?