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 must not rust you must not rust he must not rust we must not rust you must not rust they must not rust	I must not be rusting you must not be rusting he must not be rusting we must not be rusting you must not be rusting they must not be rusting
Perfect	V-ing perfect
I must not have rusted you must not have rusted he must not have rusted we must not have rusted you must not have rusted they must not have rusted	I must not have been rusting you must not have been rusting he must not have been rusting we must not have been rusting you must not have been rusting they must not 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
must I not rust? must you not rust? must he not rust? must we not rust? must you not rust? must they not rust?	must I not be rusting? must you not be rusting? must he not be rusting? must we not be rusting? must you not be rusting? must they not be rusting?
Perfect	V-ing perfect
must I not have rusted? must you not have rusted? must he not have rusted? must we not have rusted? must you not have rusted? must they not have rusted?	must I not have been rusting? must you not have been rusting? must he not have been rusting? must we not have been rusting? must you not have been rusting? must they not have been rusting?