English verb conjugation
MUST ENTERTAIN

Regular verb: entertain - entertained - entertained

Affirmation

Simple form	V-ing form
I must entertain you must entertain he must entertain we must entertain you must entertain they must entertain	I must be entertaining you must be entertaining he must be entertaining we must be entertaining you must be entertaining they must be entertaining
Perfect	V-ing perfect
I must have entertained you must have entertained he must have entertained we must have entertained you must have entertained they must have entertained	I must have been entertaining you must have been entertaining he must have been entertaining we must have been entertaining you must have been entertaining they must have been entertaining

Negation

Simple form	V-ing form
I mustn't entertain you mustn't entertain he mustn't entertain we mustn't entertain you mustn't entertain they mustn't entertain	I mustn't be entertaining you mustn't be entertaining he mustn't be entertaining we mustn't be entertaining you mustn't be entertaining they mustn't be entertaining
Perfect	V-ing perfect
I mustn't have entertained you mustn't have entertained he mustn't have entertained we mustn't have entertained you mustn't have entertained they mustn't have entertained	I mustn't have been entertaining you mustn't have been entertaining he mustn't have been entertaining we mustn't have been entertaining you mustn't have been entertaining they mustn't have been entertaining

Interrogative form

Simple form	V-ing form
must I entertain? must you entertain? must he entertain? must we entertain? must you entertain? must they entertain?	must I be entertaining? must you be entertaining? must he be entertaining? must we be entertaining? must you be entertaining? must they be entertaining?
Perfect	V-ing perfect
must I have entertained? must you have entertained? must he have entertained? must we have entertained? must you have entertained? must they have entertained?	must I have been entertaining? must you have been entertaining? must he have been entertaining? must we have been entertaining? must you have been entertaining? must they have been entertaining?

Interro-negative form

Simple form	V-ing form
mustn't I entertain? mustn't you entertain? mustn't he entertain? mustn't we entertain? mustn't you entertain? mustn't they entertain?	mustn't I be entertaining? mustn't you be entertaining? mustn't he be entertaining? mustn't we be entertaining? mustn't you be entertaining? mustn't they be entertaining?
Perfect	V-ing perfect
mustn't I have entertained? mustn't you have entertained? mustn't he have entertained? mustn't we have entertained? mustn't you have entertained? mustn't they have entertained?	mustn't I have been entertaining? mustn't you have been entertaining? mustn't he have been entertaining? mustn't we have been entertaining? mustn't you have been entertaining? mustn't they have been entertaining?