English verb conjugation
MUST PREBOARD

Regular verb: preboard - preboarded - preboarded

Affirmation

Simple form	V-ing form
I must preboard you must preboard she must preboard we must preboard you must preboard they must preboard	I must be preboarding you must be preboarding she must be preboarding we must be preboarding you must be preboarding they must be preboarding
Perfect	V-ing perfect
I must have preboarded you must have preboarded she must have preboarded we must have preboarded you must have preboarded they must have preboarded	I must have been preboarding you must have been preboarding she must have been preboarding we must have been preboarding you must have been preboarding they must have been preboarding

Negation

Simple form	V-ing form
I mustn't preboard you mustn't preboard she mustn't preboard we mustn't preboard you mustn't preboard they mustn't preboard	I mustn't be preboarding you mustn't be preboarding she mustn't be preboarding we mustn't be preboarding you mustn't be preboarding they mustn't be preboarding
Perfect	V-ing perfect
I mustn't have preboarded you mustn't have preboarded she mustn't have preboarded we mustn't have preboarded you mustn't have preboarded they mustn't have preboarded	I mustn't have been preboarding you mustn't have been preboarding she mustn't have been preboarding we mustn't have been preboarding you mustn't have been preboarding they mustn't have been preboarding

Interrogative form

Simple form	V-ing form
must I preboard? must you preboard? must she preboard? must we preboard? must you preboard? must they preboard?	must I be preboarding? must you be preboarding? must she be preboarding? must we be preboarding? must you be preboarding? must they be preboarding?
Perfect	V-ing perfect
must I have preboarded? must you have preboarded? must she have preboarded? must we have preboarded? must you have preboarded? must they have preboarded?	must I have been preboarding? must you have been preboarding? must she have been preboarding? must we have been preboarding? must you have been preboarding? must they have been preboarding?

Interro-negative form

Simple form	V-ing form
mustn't I preboard? mustn't you preboard? mustn't she preboard? mustn't we preboard? mustn't you preboard? mustn't they preboard?	mustn't I be preboarding? mustn't you be preboarding? mustn't she be preboarding? mustn't we be preboarding? mustn't you be preboarding? mustn't they be preboarding?
Perfect	V-ing perfect
mustn't I have preboarded? mustn't you have preboarded? mustn't she have preboarded? mustn't we have preboarded? mustn't you have preboarded? mustn't they have preboarded?	mustn't I have been preboarding? mustn't you have been preboarding? mustn't she have been preboarding? mustn't we have been preboarding? mustn't you have been preboarding? mustn't they have been preboarding?