I must memorize you must memorize he must memorize we must memorize you must memorize they must memorize
V-ing form
I must be memorizing you must be memorizing he must be memorizing we must be memorizing you must be memorizing they must be memorizing
Perfect
I must have memorized you must have memorized he must have memorized we must have memorized you must have memorized they must have memorized
V-ing perfect
I must have been memorizing you must have been memorizing he must have been memorizing we must have been memorizing you must have been memorizing they must have been memorizing
Negation
Simple form
I mustn't memorize you mustn't memorize he mustn't memorize we mustn't memorize you mustn't memorize they mustn't memorize
V-ing form
I mustn't be memorizing you mustn't be memorizing he mustn't be memorizing we mustn't be memorizing you mustn't be memorizing they mustn't be memorizing
Perfect
I mustn't have memorized you mustn't have memorized he mustn't have memorized we mustn't have memorized you mustn't have memorized they mustn't have memorized
V-ing perfect
I mustn't have been memorizing you mustn't have been memorizing he mustn't have been memorizing we mustn't have been memorizing you mustn't have been memorizing they mustn't have been memorizing
Interrogative form
Simple form
must I memorize? must you memorize? must he memorize? must we memorize? must you memorize? must they memorize?
V-ing form
must I be memorizing? must you be memorizing? must he be memorizing? must we be memorizing? must you be memorizing? must they be memorizing?
Perfect
must I have memorized? must you have memorized? must he have memorized? must we have memorized? must you have memorized? must they have memorized?
V-ing perfect
must I have been memorizing? must you have been memorizing? must he have been memorizing? must we have been memorizing? must you have been memorizing? must they have been memorizing?
Interro-negative form
Simple form
mustn't I memorize? mustn't you memorize? mustn't he memorize? mustn't we memorize? mustn't you memorize? mustn't they memorize?
V-ing form
mustn't I be memorizing? mustn't you be memorizing? mustn't he be memorizing? mustn't we be memorizing? mustn't you be memorizing? mustn't they be memorizing?
Perfect
mustn't I have memorized? mustn't you have memorized? mustn't he have memorized? mustn't we have memorized? mustn't you have memorized? mustn't they have memorized?
V-ing perfect
mustn't I have been memorizing? mustn't you have been memorizing? mustn't he have been memorizing? mustn't we have been memorizing? mustn't you have been memorizing? mustn't they have been memorizing?