English verb conjugation
MUST CONTAIN

Regular verb: contain - contained - contained

Affirmation

Simple form	V-ing form
I must contain you must contain he must contain we must contain you must contain they must contain	I must be containing you must be containing he must be containing we must be containing you must be containing they must be containing
Perfect	V-ing perfect
I must have contained you must have contained he must have contained we must have contained you must have contained they must have contained	I must have been containing you must have been containing he must have been containing we must have been containing you must have been containing they must have been containing

Negation

Simple form	V-ing form
I mustn't contain you mustn't contain he mustn't contain we mustn't contain you mustn't contain they mustn't contain	I mustn't be containing you mustn't be containing he mustn't be containing we mustn't be containing you mustn't be containing they mustn't be containing
Perfect	V-ing perfect
I mustn't have contained you mustn't have contained he mustn't have contained we mustn't have contained you mustn't have contained they mustn't have contained	I mustn't have been containing you mustn't have been containing he mustn't have been containing we mustn't have been containing you mustn't have been containing they mustn't have been containing

Interrogative form

Simple form	V-ing form
must I contain? must you contain? must he contain? must we contain? must you contain? must they contain?	must I be containing? must you be containing? must he be containing? must we be containing? must you be containing? must they be containing?
Perfect	V-ing perfect
must I have contained? must you have contained? must he have contained? must we have contained? must you have contained? must they have contained?	must I have been containing? must you have been containing? must he have been containing? must we have been containing? must you have been containing? must they have been containing?

Interro-negative form

Simple form	V-ing form
mustn't I contain? mustn't you contain? mustn't he contain? mustn't we contain? mustn't you contain? mustn't they contain?	mustn't I be containing? mustn't you be containing? mustn't he be containing? mustn't we be containing? mustn't you be containing? mustn't they be containing?
Perfect	V-ing perfect
mustn't I have contained? mustn't you have contained? mustn't he have contained? mustn't we have contained? mustn't you have contained? mustn't they have contained?	mustn't I have been containing? mustn't you have been containing? mustn't he have been containing? mustn't we have been containing? mustn't you have been containing? mustn't they have been containing?