I must caption you must caption he must caption we must caption you must caption they must caption
V-ing form
I must be captioning you must be captioning he must be captioning we must be captioning you must be captioning they must be captioning
Perfect
I must have captioned you must have captioned he must have captioned we must have captioned you must have captioned they must have captioned
V-ing perfect
I must have been captioning you must have been captioning he must have been captioning we must have been captioning you must have been captioning they must have been captioning
Negation
Simple form
I must not caption you must not caption he must not caption we must not caption you must not caption they must not caption
V-ing form
I must not be captioning you must not be captioning he must not be captioning we must not be captioning you must not be captioning they must not be captioning
Perfect
I must not have captioned you must not have captioned he must not have captioned we must not have captioned you must not have captioned they must not have captioned
V-ing perfect
I must not have been captioning you must not have been captioning he must not have been captioning we must not have been captioning you must not have been captioning they must not have been captioning
Interrogative form
Simple form
must I caption? must you caption? must he caption? must we caption? must you caption? must they caption?
V-ing form
must I be captioning? must you be captioning? must he be captioning? must we be captioning? must you be captioning? must they be captioning?
Perfect
must I have captioned? must you have captioned? must he have captioned? must we have captioned? must you have captioned? must they have captioned?
V-ing perfect
must I have been captioning? must you have been captioning? must he have been captioning? must we have been captioning? must you have been captioning? must they have been captioning?
Interro-negative form
Simple form
must I not caption? must you not caption? must he not caption? must we not caption? must you not caption? must they not caption?
V-ing form
must I not be captioning? must you not be captioning? must he not be captioning? must we not be captioning? must you not be captioning? must they not be captioning?
Perfect
must I not have captioned? must you not have captioned? must he not have captioned? must we not have captioned? must you not have captioned? must they not have captioned?
V-ing perfect
must I not have been captioning? must you not have been captioning? must he not have been captioning? must we not have been captioning? must you not have been captioning? must they not have been captioning?