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