English verb conjugation
MUST FALL

Irregular verb: fall - fell - fallen

Affirmation

Simple form	V-ing form
I must fall you must fall she must fall we must fall you must fall they must fall	I must be falling you must be falling she must be falling we must be falling you must be falling they must be falling
Perfect	V-ing perfect
I must have fallen you must have fallen she must have fallen we must have fallen you must have fallen they must have fallen	I must have been falling you must have been falling she must have been falling we must have been falling you must have been falling they must have been falling

Negation

Simple form	V-ing form
I mustn't fall you mustn't fall she mustn't fall we mustn't fall you mustn't fall they mustn't fall	I mustn't be falling you mustn't be falling she mustn't be falling we mustn't be falling you mustn't be falling they mustn't be falling
Perfect	V-ing perfect
I mustn't have fallen you mustn't have fallen she mustn't have fallen we mustn't have fallen you mustn't have fallen they mustn't have fallen	I mustn't have been falling you mustn't have been falling she mustn't have been falling we mustn't have been falling you mustn't have been falling they mustn't have been falling

Interrogative form

Simple form	V-ing form
must I fall? must you fall? must she fall? must we fall? must you fall? must they fall?	must I be falling? must you be falling? must she be falling? must we be falling? must you be falling? must they be falling?
Perfect	V-ing perfect
must I have fallen? must you have fallen? must she have fallen? must we have fallen? must you have fallen? must they have fallen?	must I have been falling? must you have been falling? must she have been falling? must we have been falling? must you have been falling? must they have been falling?

Interro-negative form

Simple form	V-ing form
mustn't I fall? mustn't you fall? mustn't she fall? mustn't we fall? mustn't you fall? mustn't they fall?	mustn't I be falling? mustn't you be falling? mustn't she be falling? mustn't we be falling? mustn't you be falling? mustn't they be falling?
Perfect	V-ing perfect
mustn't I have fallen? mustn't you have fallen? mustn't she have fallen? mustn't we have fallen? mustn't you have fallen? mustn't they have fallen?	mustn't I have been falling? mustn't you have been falling? mustn't she have been falling? mustn't we have been falling? mustn't you have been falling? mustn't they have been falling?