Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must contain contain you must contain contain he must contain contain we must contain contain you must contain contain they must contain contain
V-ing form
I must be contain containing you must be contain containing he must be contain containing we must be contain containing you must be contain containing they must be contain containing
Perfect
I must have contain contained you must have contain contained he must have contain contained we must have contain contained you must have contain contained they must have contain contained
V-ing perfect
I must have been contain containing you must have been contain containing he must have been contain containing we must have been contain containing you must have been contain containing they must have been contain containing
Negation
Simple form
I must not contain contain you must not contain contain he must not contain contain we must not contain contain you must not contain contain they must not contain contain
V-ing form
I must not be contain containing you must not be contain containing he must not be contain containing we must not be contain containing you must not be contain containing they must not be contain containing
Perfect
I must not have contain contained you must not have contain contained he must not have contain contained we must not have contain contained you must not have contain contained they must not have contain contained
V-ing perfect
I must not have been contain containing you must not have been contain containing he must not have been contain containing we must not have been contain containing you must not have been contain containing they must not have been contain containing
Interrogative form
Simple form
must I contain contain? must you contain contain? must he contain contain? must we contain contain? must you contain contain? must they contain contain?
V-ing form
must I be contain containing? must you be contain containing? must he be contain containing? must we be contain containing? must you be contain containing? must they be contain containing?
Perfect
must I have contain contained? must you have contain contained? must he have contain contained? must we have contain contained? must you have contain contained? must they have contain contained?
V-ing perfect
must I have been contain containing? must you have been contain containing? must he have been contain containing? must we have been contain containing? must you have been contain containing? must they have been contain containing?
Interro-negative form
Simple form
must I not contain contain? must you not contain contain? must he not contain contain? must we not contain contain? must you not contain contain? must they not contain contain?
V-ing form
must I not be contain containing? must you not be contain containing? must he not be contain containing? must we not be contain containing? must you not be contain containing? must they not be contain containing?
Perfect
must I not have contain contained? must you not have contain contained? must he not have contain contained? must we not have contain contained? must you not have contain contained? must they not have contain contained?
V-ing perfect
must I not have been contain containing? must you not have been contain containing? must he not have been contain containing? must we not have been contain containing? must you not have been contain containing? must they not have been contain containing?