I must multiply you must multiply she must multiply we must multiply you must multiply they must multiply
V-ing form
I must be multiplying you must be multiplying she must be multiplying we must be multiplying you must be multiplying they must be multiplying
Perfect
I must have multiplied you must have multiplied she 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 she must have been multiplying we must have been multiplying you must have been multiplying they must have been multiplying
Negation
Simple form
I must not multiply you must not multiply she must not multiply we must not multiply you must not multiply they must not multiply
V-ing form
I must not be multiplying you must not be multiplying she must not be multiplying we must not be multiplying you must not be multiplying they must not be multiplying
Perfect
I must not have multiplied you must not have multiplied she must not have multiplied we must not have multiplied you must not have multiplied they must not have multiplied
V-ing perfect
I must not have been multiplying you must not have been multiplying she must not have been multiplying we must not have been multiplying you must not have been multiplying they must not have been multiplying
Interrogative form
Simple form
must I multiply? must you multiply? must she multiply? must we multiply? must you multiply? must they multiply?
V-ing form
must I be multiplying? must you be multiplying? must she be multiplying? must we be multiplying? must you be multiplying? must they be multiplying?
Perfect
must I have multiplied? must you have multiplied? must she 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 she have been multiplying? must we have been multiplying? must you have been multiplying? must they have been multiplying?
Interro-negative form
Simple form
must I not multiply? must you not multiply? must she not multiply? must we not multiply? must you not multiply? must they not multiply?
V-ing form
must I not be multiplying? must you not be multiplying? must she not be multiplying? must we not be multiplying? must you not be multiplying? must they not be multiplying?
Perfect
must I not have multiplied? must you not have multiplied? must she not have multiplied? must we not have multiplied? must you not have multiplied? must they not have multiplied?
V-ing perfect
must I not have been multiplying? must you not have been multiplying? must she not have been multiplying? must we not have been multiplying? must you not have been multiplying? must they not have been multiplying?