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