English verb conjugation
MUST CHAIR

Regular verb: chair - chaired - chaired

Affirmation

Simple form	V-ing form
I must chair you must chair he must chair we must chair you must chair they must chair	I must be chairing you must be chairing he must be chairing we must be chairing you must be chairing they must be chairing
Perfect	V-ing perfect
I must have chaired you must have chaired he must have chaired we must have chaired you must have chaired they must have chaired	I must have been chairing you must have been chairing he must have been chairing we must have been chairing you must have been chairing they must have been chairing

Negation

Simple form	V-ing form
I mustn't chair you mustn't chair he mustn't chair we mustn't chair you mustn't chair they mustn't chair	I mustn't be chairing you mustn't be chairing he mustn't be chairing we mustn't be chairing you mustn't be chairing they mustn't be chairing
Perfect	V-ing perfect
I mustn't have chaired you mustn't have chaired he mustn't have chaired we mustn't have chaired you mustn't have chaired they mustn't have chaired	I mustn't have been chairing you mustn't have been chairing he mustn't have been chairing we mustn't have been chairing you mustn't have been chairing they mustn't have been chairing

Interrogative form

Simple form	V-ing form
must I chair? must you chair? must he chair? must we chair? must you chair? must they chair?	must I be chairing? must you be chairing? must he be chairing? must we be chairing? must you be chairing? must they be chairing?
Perfect	V-ing perfect
must I have chaired? must you have chaired? must he have chaired? must we have chaired? must you have chaired? must they have chaired?	must I have been chairing? must you have been chairing? must he have been chairing? must we have been chairing? must you have been chairing? must they have been chairing?

Interro-negative form

Simple form	V-ing form
mustn't I chair? mustn't you chair? mustn't he chair? mustn't we chair? mustn't you chair? mustn't they chair?	mustn't I be chairing? mustn't you be chairing? mustn't he be chairing? mustn't we be chairing? mustn't you be chairing? mustn't they be chairing?
Perfect	V-ing perfect
mustn't I have chaired? mustn't you have chaired? mustn't he have chaired? mustn't we have chaired? mustn't you have chaired? mustn't they have chaired?	mustn't I have been chairing? mustn't you have been chairing? mustn't he have been chairing? mustn't we have been chairing? mustn't you have been chairing? mustn't they have been chairing?