English verb conjugation
MUST DISCOVER

Regular verb: discover - discovered - discovered

Affirmation

Simple form	V-ing form
I must discover you must discover he must discover we must discover you must discover they must discover	I must be discovering you must be discovering he must be discovering we must be discovering you must be discovering they must be discovering
Perfect	V-ing perfect
I must have discovered you must have discovered he must have discovered we must have discovered you must have discovered they must have discovered	I must have been discovering you must have been discovering he must have been discovering we must have been discovering you must have been discovering they must have been discovering

Negation

Simple form	V-ing form
I mustn't discover you mustn't discover he mustn't discover we mustn't discover you mustn't discover they mustn't discover	I mustn't be discovering you mustn't be discovering he mustn't be discovering we mustn't be discovering you mustn't be discovering they mustn't be discovering
Perfect	V-ing perfect
I mustn't have discovered you mustn't have discovered he mustn't have discovered we mustn't have discovered you mustn't have discovered they mustn't have discovered	I mustn't have been discovering you mustn't have been discovering he mustn't have been discovering we mustn't have been discovering you mustn't have been discovering they mustn't have been discovering

Interrogative form

Simple form	V-ing form
must I discover? must you discover? must he discover? must we discover? must you discover? must they discover?	must I be discovering? must you be discovering? must he be discovering? must we be discovering? must you be discovering? must they be discovering?
Perfect	V-ing perfect
must I have discovered? must you have discovered? must he have discovered? must we have discovered? must you have discovered? must they have discovered?	must I have been discovering? must you have been discovering? must he have been discovering? must we have been discovering? must you have been discovering? must they have been discovering?

Interro-negative form

Simple form	V-ing form
mustn't I discover? mustn't you discover? mustn't he discover? mustn't we discover? mustn't you discover? mustn't they discover?	mustn't I be discovering? mustn't you be discovering? mustn't he be discovering? mustn't we be discovering? mustn't you be discovering? mustn't they be discovering?
Perfect	V-ing perfect
mustn't I have discovered? mustn't you have discovered? mustn't he have discovered? mustn't we have discovered? mustn't you have discovered? mustn't they have discovered?	mustn't I have been discovering? mustn't you have been discovering? mustn't he have been discovering? mustn't we have been discovering? mustn't you have been discovering? mustn't they have been discovering?