must multiply
Regular verb: multiply - multiplied- multiplied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must multiply
you must multiply
she must multiply
we must multiply
you must multiply
they must multiply 	I must be multiplying
you must be multiplying
she must be multiplying
we must be multiplying
you must be multiplying
they must be multiplying	I must have multiplied
you must have multiplied
she must have multiplied
we must have multiplied
you must have multiplied
they must have multiplied	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 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't multiply
you mustn't multiply
she mustn't multiply
we mustn't multiply
you mustn't multiply
they mustn't multiply 	I mustn't be multiplying
you mustn't be multiplying
she mustn't be multiplying
we mustn't be multiplying
you mustn't be multiplying
they mustn't be multiplying	I mustn't have multiplied
you mustn't have multiplied
she mustn't have multiplied
we mustn't have multiplied
you mustn't have multiplied
they mustn't have multiplied	I mustn't have been multiplying
you mustn't have been multiplying
she 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 	V-ing form 	Perfect 	V-ing perfect 	
must I multiply?
must you multiply?
must she multiply?
must we multiply?
must you multiply?
must they multiply? 	must I be multiplying?
must you be multiplying?
must she be multiplying?
must we be multiplying?
must you be multiplying?
must they be multiplying? 	must I have multiplied?
must you have multiplied?
must she have multiplied?
must we have multiplied?
must you have multiplied?
must they have multiplied? 	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 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I multiply?
mustn't you multiply?
mustn't she multiply?
mustn't we multiply?
mustn't you multiply?
mustn't they multiply? 	mustn't I be multiplying?
mustn't you be multiplying?
mustn't she be multiplying?
mustn't we be multiplying?
mustn't you be multiplying?
mustn't they be multiplying? 	mustn't I have multiplied?
mustn't you have multiplied?
mustn't she have multiplied?
mustn't we have multiplied?
mustn't you have multiplied?
mustn't they have multiplied? 	mustn't I have been multiplying?
mustn't you have been multiplying?
mustn't she have been multiplying?
mustn't we have been multiplying?
mustn't you have been multiplying?
mustn't they have been multiplying?