Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must piggy you must piggy she must piggy we must piggy you must piggy they must piggy
V-ing form
I must be piggying you must be piggying she must be piggying we must be piggying you must be piggying they must be piggying
Perfect
I must have piggied you must have piggied she must have piggied we must have piggied you must have piggied they must have piggied
V-ing perfect
I must have been piggying you must have been piggying she must have been piggying we must have been piggying you must have been piggying they must have been piggying
Negation
Simple form
I mustn't piggy you mustn't piggy she mustn't piggy we mustn't piggy you mustn't piggy they mustn't piggy
V-ing form
I mustn't be piggying you mustn't be piggying she mustn't be piggying we mustn't be piggying you mustn't be piggying they mustn't be piggying
Perfect
I mustn't have piggied you mustn't have piggied she mustn't have piggied we mustn't have piggied you mustn't have piggied they mustn't have piggied
V-ing perfect
I mustn't have been piggying you mustn't have been piggying she mustn't have been piggying we mustn't have been piggying you mustn't have been piggying they mustn't have been piggying
Interrogative form
Simple form
must I piggy? must you piggy? must she piggy? must we piggy? must you piggy? must they piggy?
V-ing form
must I be piggying? must you be piggying? must she be piggying? must we be piggying? must you be piggying? must they be piggying?
Perfect
must I have piggied? must you have piggied? must she have piggied? must we have piggied? must you have piggied? must they have piggied?
V-ing perfect
must I have been piggying? must you have been piggying? must she have been piggying? must we have been piggying? must you have been piggying? must they have been piggying?
Interro-negative form
Simple form
mustn't I piggy? mustn't you piggy? mustn't she piggy? mustn't we piggy? mustn't you piggy? mustn't they piggy?
V-ing form
mustn't I be piggying? mustn't you be piggying? mustn't she be piggying? mustn't we be piggying? mustn't you be piggying? mustn't they be piggying?
Perfect
mustn't I have piggied? mustn't you have piggied? mustn't she have piggied? mustn't we have piggied? mustn't you have piggied? mustn't they have piggied?
V-ing perfect
mustn't I have been piggying? mustn't you have been piggying? mustn't she have been piggying? mustn't we have been piggying? mustn't you have been piggying? mustn't they have been piggying?