English verb conjugation
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Regular verb: worst - worsted - worsted

Affirmation

Simple form	V-ing form
I must worst you must worst he must worst we must worst you must worst they must worst	I must be worsting you must be worsting he must be worsting we must be worsting you must be worsting they must be worsting
Perfect	V-ing perfect
I must have worsted you must have worsted he must have worsted we must have worsted you must have worsted they must have worsted	I must have been worsting you must have been worsting he must have been worsting we must have been worsting you must have been worsting they must have been worsting

Negation

Simple form	V-ing form
I mustn't worst you mustn't worst he mustn't worst we mustn't worst you mustn't worst they mustn't worst	I mustn't be worsting you mustn't be worsting he mustn't be worsting we mustn't be worsting you mustn't be worsting they mustn't be worsting
Perfect	V-ing perfect
I mustn't have worsted you mustn't have worsted he mustn't have worsted we mustn't have worsted you mustn't have worsted they mustn't have worsted	I mustn't have been worsting you mustn't have been worsting he mustn't have been worsting we mustn't have been worsting you mustn't have been worsting they mustn't have been worsting

Interrogative form

Simple form	V-ing form
must I worst? must you worst? must he worst? must we worst? must you worst? must they worst?	must I be worsting? must you be worsting? must he be worsting? must we be worsting? must you be worsting? must they be worsting?
Perfect	V-ing perfect
must I have worsted? must you have worsted? must he have worsted? must we have worsted? must you have worsted? must they have worsted?	must I have been worsting? must you have been worsting? must he have been worsting? must we have been worsting? must you have been worsting? must they have been worsting?

Interro-negative form

Simple form	V-ing form
mustn't I worst? mustn't you worst? mustn't he worst? mustn't we worst? mustn't you worst? mustn't they worst?	mustn't I be worsting? mustn't you be worsting? mustn't he be worsting? mustn't we be worsting? mustn't you be worsting? mustn't they be worsting?
Perfect	V-ing perfect
mustn't I have worsted? mustn't you have worsted? mustn't he have worsted? mustn't we have worsted? mustn't you have worsted? mustn't they have worsted?	mustn't I have been worsting? mustn't you have been worsting? mustn't he have been worsting? mustn't we have been worsting? mustn't you have been worsting? mustn't they have been worsting?