English verb conjugation
MUST COMPLAIN

Regular verb: complain - complained - complained

Affirmation

Simple form	V-ing form
I must complain you must complain he must complain we must complain you must complain they must complain	I must be complaining you must be complaining he must be complaining we must be complaining you must be complaining they must be complaining
Perfect	V-ing perfect
I must have complained you must have complained he must have complained we must have complained you must have complained they must have complained	I must have been complaining you must have been complaining he must have been complaining we must have been complaining you must have been complaining they must have been complaining

Negation

Simple form	V-ing form
I mustn't complain you mustn't complain he mustn't complain we mustn't complain you mustn't complain they mustn't complain	I mustn't be complaining you mustn't be complaining he mustn't be complaining we mustn't be complaining you mustn't be complaining they mustn't be complaining
Perfect	V-ing perfect
I mustn't have complained you mustn't have complained he mustn't have complained we mustn't have complained you mustn't have complained they mustn't have complained	I mustn't have been complaining you mustn't have been complaining he mustn't have been complaining we mustn't have been complaining you mustn't have been complaining they mustn't have been complaining

Interrogative form

Simple form	V-ing form
must I complain? must you complain? must he complain? must we complain? must you complain? must they complain?	must I be complaining? must you be complaining? must he be complaining? must we be complaining? must you be complaining? must they be complaining?
Perfect	V-ing perfect
must I have complained? must you have complained? must he have complained? must we have complained? must you have complained? must they have complained?	must I have been complaining? must you have been complaining? must he have been complaining? must we have been complaining? must you have been complaining? must they have been complaining?

Interro-negative form

Simple form	V-ing form
mustn't I complain? mustn't you complain? mustn't he complain? mustn't we complain? mustn't you complain? mustn't they complain?	mustn't I be complaining? mustn't you be complaining? mustn't he be complaining? mustn't we be complaining? mustn't you be complaining? mustn't they be complaining?
Perfect	V-ing perfect
mustn't I have complained? mustn't you have complained? mustn't he have complained? mustn't we have complained? mustn't you have complained? mustn't they have complained?	mustn't I have been complaining? mustn't you have been complaining? mustn't he have been complaining? mustn't we have been complaining? mustn't you have been complaining? mustn't they have been complaining?