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