English verb conjugation
MUST ENTERTAIN

Regular verb: entertain - entertained - entertained

Affirmation

Simple form	V-ing form
I must entertain you must entertain she must entertain we must entertain you must entertain they must entertain	I must be entertaining you must be entertaining she 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 she 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 she 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 must not entertain you must not entertain she must not entertain we must not entertain you must not entertain they must not entertain	I must not be entertaining you must not be entertaining she must not be entertaining we must not be entertaining you must not be entertaining they must not be entertaining
Perfect	V-ing perfect
I must not have entertained you must not have entertained she must not have entertained we must not have entertained you must not have entertained they must not have entertained	I must not have been entertaining you must not have been entertaining she must not have been entertaining we must not have been entertaining you must not have been entertaining they must not have been entertaining

Interrogative form

Simple form	V-ing form
must I entertain? must you entertain? must she entertain? must we entertain? must you entertain? must they entertain?	must I be entertaining? must you be entertaining? must she 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 she 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 she 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
must I not entertain? must you not entertain? must she not entertain? must we not entertain? must you not entertain? must they not entertain?	must I not be entertaining? must you not be entertaining? must she not be entertaining? must we not be entertaining? must you not be entertaining? must they not be entertaining?
Perfect	V-ing perfect
must I not have entertained? must you not have entertained? must she not have entertained? must we not have entertained? must you not have entertained? must they not have entertained?	must I not have been entertaining? must you not have been entertaining? must she not have been entertaining? must we not have been entertaining? must you not have been entertaining? must they not have been entertaining?