English verb conjugation
MUST COLLAPSE

Regular verb: collapse - collapsed - collapsed

Affirmation

Simple form	V-ing form
I must collapse you must collapse she must collapse we must collapse you must collapse they must collapse	I must be collapsing you must be collapsing she must be collapsing we must be collapsing you must be collapsing they must be collapsing
Perfect	V-ing perfect
I must have collapsed you must have collapsed she must have collapsed we must have collapsed you must have collapsed they must have collapsed	I must have been collapsing you must have been collapsing she must have been collapsing we must have been collapsing you must have been collapsing they must have been collapsing

Negation

Simple form	V-ing form
I mustn't collapse you mustn't collapse she mustn't collapse we mustn't collapse you mustn't collapse they mustn't collapse	I mustn't be collapsing you mustn't be collapsing she mustn't be collapsing we mustn't be collapsing you mustn't be collapsing they mustn't be collapsing
Perfect	V-ing perfect
I mustn't have collapsed you mustn't have collapsed she mustn't have collapsed we mustn't have collapsed you mustn't have collapsed they mustn't have collapsed	I mustn't have been collapsing you mustn't have been collapsing she mustn't have been collapsing we mustn't have been collapsing you mustn't have been collapsing they mustn't have been collapsing

Interrogative form

Simple form	V-ing form
must I collapse? must you collapse? must she collapse? must we collapse? must you collapse? must they collapse?	must I be collapsing? must you be collapsing? must she be collapsing? must we be collapsing? must you be collapsing? must they be collapsing?
Perfect	V-ing perfect
must I have collapsed? must you have collapsed? must she have collapsed? must we have collapsed? must you have collapsed? must they have collapsed?	must I have been collapsing? must you have been collapsing? must she have been collapsing? must we have been collapsing? must you have been collapsing? must they have been collapsing?

Interro-negative form

Simple form	V-ing form
mustn't I collapse? mustn't you collapse? mustn't she collapse? mustn't we collapse? mustn't you collapse? mustn't they collapse?	mustn't I be collapsing? mustn't you be collapsing? mustn't she be collapsing? mustn't we be collapsing? mustn't you be collapsing? mustn't they be collapsing?
Perfect	V-ing perfect
mustn't I have collapsed? mustn't you have collapsed? mustn't she have collapsed? mustn't we have collapsed? mustn't you have collapsed? mustn't they have collapsed?	mustn't I have been collapsing? mustn't you have been collapsing? mustn't she have been collapsing? mustn't we have been collapsing? mustn't you have been collapsing? mustn't they have been collapsing?