English verb conjugation
MUST GLASS

Regular verb: glass - glassed - glassed

Affirmation

Simple form	V-ing form
I must glass you must glass he must glass we must glass you must glass they must glass	I must be glassing you must be glassing he must be glassing we must be glassing you must be glassing they must be glassing
Perfect	V-ing perfect
I must have glassed you must have glassed he must have glassed we must have glassed you must have glassed they must have glassed	I must have been glassing you must have been glassing he must have been glassing we must have been glassing you must have been glassing they must have been glassing

Negation

Simple form	V-ing form
I mustn't glass you mustn't glass he mustn't glass we mustn't glass you mustn't glass they mustn't glass	I mustn't be glassing you mustn't be glassing he mustn't be glassing we mustn't be glassing you mustn't be glassing they mustn't be glassing
Perfect	V-ing perfect
I mustn't have glassed you mustn't have glassed he mustn't have glassed we mustn't have glassed you mustn't have glassed they mustn't have glassed	I mustn't have been glassing you mustn't have been glassing he mustn't have been glassing we mustn't have been glassing you mustn't have been glassing they mustn't have been glassing

Interrogative form

Simple form	V-ing form
must I glass? must you glass? must he glass? must we glass? must you glass? must they glass?	must I be glassing? must you be glassing? must he be glassing? must we be glassing? must you be glassing? must they be glassing?
Perfect	V-ing perfect
must I have glassed? must you have glassed? must he have glassed? must we have glassed? must you have glassed? must they have glassed?	must I have been glassing? must you have been glassing? must he have been glassing? must we have been glassing? must you have been glassing? must they have been glassing?

Interro-negative form

Simple form	V-ing form
mustn't I glass? mustn't you glass? mustn't he glass? mustn't we glass? mustn't you glass? mustn't they glass?	mustn't I be glassing? mustn't you be glassing? mustn't he be glassing? mustn't we be glassing? mustn't you be glassing? mustn't they be glassing?
Perfect	V-ing perfect
mustn't I have glassed? mustn't you have glassed? mustn't he have glassed? mustn't we have glassed? mustn't you have glassed? mustn't they have glassed?	mustn't I have been glassing? mustn't you have been glassing? mustn't he have been glassing? mustn't we have been glassing? mustn't you have been glassing? mustn't they have been glassing?