English verb conjugation
MUST BUR

Regular verb: bur - bured - bured

Affirmation

Simple form	V-ing form
I must bur you must bur he must bur we must bur you must bur they must bur	I must be buring you must be buring he must be buring we must be buring you must be buring they must be buring
Perfect	V-ing perfect
I must have bured you must have bured he must have bured we must have bured you must have bured they must have bured	I must have been buring you must have been buring he must have been buring we must have been buring you must have been buring they must have been buring

Negation

Simple form	V-ing form
I mustn't bur you mustn't bur he mustn't bur we mustn't bur you mustn't bur they mustn't bur	I mustn't be buring you mustn't be buring he mustn't be buring we mustn't be buring you mustn't be buring they mustn't be buring
Perfect	V-ing perfect
I mustn't have bured you mustn't have bured he mustn't have bured we mustn't have bured you mustn't have bured they mustn't have bured	I mustn't have been buring you mustn't have been buring he mustn't have been buring we mustn't have been buring you mustn't have been buring they mustn't have been buring

Interrogative form

Simple form	V-ing form
must I bur? must you bur? must he bur? must we bur? must you bur? must they bur?	must I be buring? must you be buring? must he be buring? must we be buring? must you be buring? must they be buring?
Perfect	V-ing perfect
must I have bured? must you have bured? must he have bured? must we have bured? must you have bured? must they have bured?	must I have been buring? must you have been buring? must he have been buring? must we have been buring? must you have been buring? must they have been buring?

Interro-negative form

Simple form	V-ing form
mustn't I bur? mustn't you bur? mustn't he bur? mustn't we bur? mustn't you bur? mustn't they bur?	mustn't I be buring? mustn't you be buring? mustn't he be buring? mustn't we be buring? mustn't you be buring? mustn't they be buring?
Perfect	V-ing perfect
mustn't I have bured? mustn't you have bured? mustn't he have bured? mustn't we have bured? mustn't you have bured? mustn't they have bured?	mustn't I have been buring? mustn't you have been buring? mustn't he have been buring? mustn't we have been buring? mustn't you have been buring? mustn't they have been buring?