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