English verb conjugation
MUST PREVIEW

Regular verb: preview - previewed - previewed

Affirmation

Simple form	V-ing form
I must preview you must preview he must preview we must preview you must preview they must preview	I must be previewing you must be previewing he must be previewing we must be previewing you must be previewing they must be previewing
Perfect	V-ing perfect
I must have previewed you must have previewed he must have previewed we must have previewed you must have previewed they must have previewed	I must have been previewing you must have been previewing he must have been previewing we must have been previewing you must have been previewing they must have been previewing

Negation

Simple form	V-ing form
I mustn't preview you mustn't preview he mustn't preview we mustn't preview you mustn't preview they mustn't preview	I mustn't be previewing you mustn't be previewing he mustn't be previewing we mustn't be previewing you mustn't be previewing they mustn't be previewing
Perfect	V-ing perfect
I mustn't have previewed you mustn't have previewed he mustn't have previewed we mustn't have previewed you mustn't have previewed they mustn't have previewed	I mustn't have been previewing you mustn't have been previewing he mustn't have been previewing we mustn't have been previewing you mustn't have been previewing they mustn't have been previewing

Interrogative form

Simple form	V-ing form
must I preview? must you preview? must he preview? must we preview? must you preview? must they preview?	must I be previewing? must you be previewing? must he be previewing? must we be previewing? must you be previewing? must they be previewing?
Perfect	V-ing perfect
must I have previewed? must you have previewed? must he have previewed? must we have previewed? must you have previewed? must they have previewed?	must I have been previewing? must you have been previewing? must he have been previewing? must we have been previewing? must you have been previewing? must they have been previewing?

Interro-negative form

Simple form	V-ing form
mustn't I preview? mustn't you preview? mustn't he preview? mustn't we preview? mustn't you preview? mustn't they preview?	mustn't I be previewing? mustn't you be previewing? mustn't he be previewing? mustn't we be previewing? mustn't you be previewing? mustn't they be previewing?
Perfect	V-ing perfect
mustn't I have previewed? mustn't you have previewed? mustn't he have previewed? mustn't we have previewed? mustn't you have previewed? mustn't they have previewed?	mustn't I have been previewing? mustn't you have been previewing? mustn't he have been previewing? mustn't we have been previewing? mustn't you have been previewing? mustn't they have been previewing?