English verb conjugation
MUST RUST

Regular verb: rust - rusted - rusted

Affirmation

Simple form	V-ing form
I must rust you must rust he must rust we must rust you must rust they must rust	I must be rusting you must be rusting he must be rusting we must be rusting you must be rusting they must be rusting
Perfect	V-ing perfect
I must have rusted you must have rusted he must have rusted we must have rusted you must have rusted they must have rusted	I must have been rusting you must have been rusting he must have been rusting we must have been rusting you must have been rusting they must have been rusting

Negation

Simple form	V-ing form
I mustn't rust you mustn't rust he mustn't rust we mustn't rust you mustn't rust they mustn't rust	I mustn't be rusting you mustn't be rusting he mustn't be rusting we mustn't be rusting you mustn't be rusting they mustn't be rusting
Perfect	V-ing perfect
I mustn't have rusted you mustn't have rusted he mustn't have rusted we mustn't have rusted you mustn't have rusted they mustn't have rusted	I mustn't have been rusting you mustn't have been rusting he mustn't have been rusting we mustn't have been rusting you mustn't have been rusting they mustn't have been rusting

Interrogative form

Simple form	V-ing form
must I rust? must you rust? must he rust? must we rust? must you rust? must they rust?	must I be rusting? must you be rusting? must he be rusting? must we be rusting? must you be rusting? must they be rusting?
Perfect	V-ing perfect
must I have rusted? must you have rusted? must he have rusted? must we have rusted? must you have rusted? must they have rusted?	must I have been rusting? must you have been rusting? must he have been rusting? must we have been rusting? must you have been rusting? must they have been rusting?

Interro-negative form

Simple form	V-ing form
mustn't I rust? mustn't you rust? mustn't he rust? mustn't we rust? mustn't you rust? mustn't they rust?	mustn't I be rusting? mustn't you be rusting? mustn't he be rusting? mustn't we be rusting? mustn't you be rusting? mustn't they be rusting?
Perfect	V-ing perfect
mustn't I have rusted? mustn't you have rusted? mustn't he have rusted? mustn't we have rusted? mustn't you have rusted? mustn't they have rusted?	mustn't I have been rusting? mustn't you have been rusting? mustn't he have been rusting? mustn't we have been rusting? mustn't you have been rusting? mustn't they have been rusting?