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