English verb conjugation
MUST RUN

Irregular verb: run - ran - run

Affirmation

Simple form	V-ing form
I must run you must run she must run we must run you must run they must run	I must be running you must be running she 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 she 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 she 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 mustn't run you mustn't run she mustn't run we mustn't run you mustn't run they mustn't run	I mustn't be running you mustn't be running she mustn't be running we mustn't be running you mustn't be running they mustn't be running
Perfect	V-ing perfect
I mustn't have run you mustn't have run she mustn't have run we mustn't have run you mustn't have run they mustn't have run	I mustn't have been running you mustn't have been running she mustn't have been running we mustn't have been running you mustn't have been running they mustn't have been running

Interrogative form

Simple form	V-ing form
must I run? must you run? must she run? must we run? must you run? must they run?	must I be running? must you be running? must she 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 she 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 she 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
mustn't I run? mustn't you run? mustn't she run? mustn't we run? mustn't you run? mustn't they run?	mustn't I be running? mustn't you be running? mustn't she be running? mustn't we be running? mustn't you be running? mustn't they be running?
Perfect	V-ing perfect
mustn't I have run? mustn't you have run? mustn't she have run? mustn't we have run? mustn't you have run? mustn't they have run?	mustn't I have been running? mustn't you have been running? mustn't she have been running? mustn't we have been running? mustn't you have been running? mustn't they have been running?