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