English verb conjugation
MUST BUR

Regular verb: bur - bured - bured

Affirmation

Simple form	V-ing form
I must bur you must bur she must bur we must bur you must bur they must bur	I must be buring you must be buring she 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 she 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 she 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 she 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 she 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 she 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 she 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 she bur? must we bur? must you bur? must they bur?	must I be buring? must you be buring? must she 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 she 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 she 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 she 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 she 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 she 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 she have been buring? mustn't we have been buring? mustn't you have been buring? mustn't they have been buring?