must attenuate
Regular verb: attenuate - attenuated- attenuated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must attenuate
you must attenuate
she must attenuate
we must attenuate
you must attenuate
they must attenuate 	I must be attenuating
you must be attenuating
she must be attenuating
we must be attenuating
you must be attenuating
they must be attenuating	I must have attenuated
you must have attenuated
she 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
she 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
she 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
she 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
she 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
she 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 she attenuate?
must we attenuate?
must you attenuate?
must they attenuate? 	must I be attenuating?
must you be attenuating?
must she be attenuating?
must we be attenuating?
must you be attenuating?
must they be attenuating? 	must I have attenuated?
must you have attenuated?
must she 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 she 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 she 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 she 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 she 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 she have been attenuating?
mustn't we have been attenuating?
mustn't you have been attenuating?
mustn't they have been attenuating?