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