I must devastate you must devastate he must devastate we must devastate you must devastate they must devastate
V-ing form
I must be devastating you must be devastating he must be devastating we must be devastating you must be devastating they must be devastating
Perfect
I must have devastated you must have devastated he must have devastated we must have devastated you must have devastated they must have devastated
V-ing perfect
I must have been devastating you must have been devastating he must have been devastating we must have been devastating you must have been devastating they must have been devastating
Negation
Simple form
I mustn't devastate you mustn't devastate he mustn't devastate we mustn't devastate you mustn't devastate they mustn't devastate
V-ing form
I mustn't be devastating you mustn't be devastating he mustn't be devastating we mustn't be devastating you mustn't be devastating they mustn't be devastating
Perfect
I mustn't have devastated you mustn't have devastated he mustn't have devastated we mustn't have devastated you mustn't have devastated they mustn't have devastated
V-ing perfect
I mustn't have been devastating you mustn't have been devastating he mustn't have been devastating we mustn't have been devastating you mustn't have been devastating they mustn't have been devastating
Interrogative form
Simple form
must I devastate? must you devastate? must he devastate? must we devastate? must you devastate? must they devastate?
V-ing form
must I be devastating? must you be devastating? must he be devastating? must we be devastating? must you be devastating? must they be devastating?
Perfect
must I have devastated? must you have devastated? must he have devastated? must we have devastated? must you have devastated? must they have devastated?
V-ing perfect
must I have been devastating? must you have been devastating? must he have been devastating? must we have been devastating? must you have been devastating? must they have been devastating?
Interro-negative form
Simple form
mustn't I devastate? mustn't you devastate? mustn't he devastate? mustn't we devastate? mustn't you devastate? mustn't they devastate?
V-ing form
mustn't I be devastating? mustn't you be devastating? mustn't he be devastating? mustn't we be devastating? mustn't you be devastating? mustn't they be devastating?
Perfect
mustn't I have devastated? mustn't you have devastated? mustn't he have devastated? mustn't we have devastated? mustn't you have devastated? mustn't they have devastated?
V-ing perfect
mustn't I have been devastating? mustn't you have been devastating? mustn't he have been devastating? mustn't we have been devastating? mustn't you have been devastating? mustn't they have been devastating?