I must enjoy you must enjoy he must enjoy we must enjoy you must enjoy they must enjoy
V-ing form
I must be enjoying you must be enjoying he must be enjoying we must be enjoying you must be enjoying they must be enjoying
Perfect
I must have enjoyed you must have enjoyed he must have enjoyed we must have enjoyed you must have enjoyed they must have enjoyed
V-ing perfect
I must have been enjoying you must have been enjoying he must have been enjoying we must have been enjoying you must have been enjoying they must have been enjoying
Negation
Simple form
I must not enjoy you must not enjoy he must not enjoy we must not enjoy you must not enjoy they must not enjoy
V-ing form
I must not be enjoying you must not be enjoying he must not be enjoying we must not be enjoying you must not be enjoying they must not be enjoying
Perfect
I must not have enjoyed you must not have enjoyed he must not have enjoyed we must not have enjoyed you must not have enjoyed they must not have enjoyed
V-ing perfect
I must not have been enjoying you must not have been enjoying he must not have been enjoying we must not have been enjoying you must not have been enjoying they must not have been enjoying
Interrogative form
Simple form
must I enjoy? must you enjoy? must he enjoy? must we enjoy? must you enjoy? must they enjoy?
V-ing form
must I be enjoying? must you be enjoying? must he be enjoying? must we be enjoying? must you be enjoying? must they be enjoying?
Perfect
must I have enjoyed? must you have enjoyed? must he have enjoyed? must we have enjoyed? must you have enjoyed? must they have enjoyed?
V-ing perfect
must I have been enjoying? must you have been enjoying? must he have been enjoying? must we have been enjoying? must you have been enjoying? must they have been enjoying?
Interro-negative form
Simple form
must I not enjoy? must you not enjoy? must he not enjoy? must we not enjoy? must you not enjoy? must they not enjoy?
V-ing form
must I not be enjoying? must you not be enjoying? must he not be enjoying? must we not be enjoying? must you not be enjoying? must they not be enjoying?
Perfect
must I not have enjoyed? must you not have enjoyed? must he not have enjoyed? must we not have enjoyed? must you not have enjoyed? must they not have enjoyed?
V-ing perfect
must I not have been enjoying? must you not have been enjoying? must he not have been enjoying? must we not have been enjoying? must you not have been enjoying? must they not have been enjoying?