English verb conjugation
MUST RUN

Irregular verb: run - ran - run

Affirmation

Simple form	V-ing form
I must run you must run he must run we must run you must run they must run	I must be running you must be running he must be running we must be running you must be running they must be running
Perfect	V-ing perfect
I must have run you must have run he must have run we must have run you must have run they must have run	I must have been running you must have been running he must have been running we must have been running you must have been running they must have been running

Negation

Simple form	V-ing form
I must not run you must not run he must not run we must not run you must not run they must not run	I must not be running you must not be running he must not be running we must not be running you must not be running they must not be running
Perfect	V-ing perfect
I must not have run you must not have run he must not have run we must not have run you must not have run they must not have run	I must not have been running you must not have been running he must not have been running we must not have been running you must not have been running they must not have been running

Interrogative form

Simple form	V-ing form
must I run? must you run? must he run? must we run? must you run? must they run?	must I be running? must you be running? must he be running? must we be running? must you be running? must they be running?
Perfect	V-ing perfect
must I have run? must you have run? must he have run? must we have run? must you have run? must they have run?	must I have been running? must you have been running? must he have been running? must we have been running? must you have been running? must they have been running?

Interro-negative form

Simple form	V-ing form
must I not run? must you not run? must he not run? must we not run? must you not run? must they not run?	must I not be running? must you not be running? must he not be running? must we not be running? must you not be running? must they not be running?
Perfect	V-ing perfect
must I not have run? must you not have run? must he not have run? must we not have run? must you not have run? must they not have run?	must I not have been running? must you not have been running? must he not have been running? must we not have been running? must you not have been running? must they not have been running?