English verb conjugation
MUST CONTAIN

Regular verb: contain - contained - contained

Affirmation

Simple form	V-ing form
I must contain you must contain she must contain we must contain you must contain they must contain	I must be containing you must be containing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she contain? must we contain? must you contain? must they contain?	must I be containing? must you be containing? must she 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 she 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 she 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 she 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 she 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 she 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 she have been containing? mustn't we have been containing? mustn't you have been containing? mustn't they have been containing?