must invent
Verbo regular: invent - invented- invented

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must invent
you must invent
she must invent
we must invent
you must invent
they must invent 	I must be inventing
you must be inventing
she must be inventing
we must be inventing
you must be inventing
they must be inventing	I must have invented
you must have invented
she must have invented
we must have invented
you must have invented
they must have invented	I must have been inventing
you must have been inventing
she must have been inventing
we must have been inventing
you must have been inventing
they must have been inventing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not invent
you must not invent
she must not invent
we must not invent
you must not invent
they must not invent 	I must not be inventing
you must not be inventing
she must not be inventing
we must not be inventing
you must not be inventing
they must not be inventing	I must not have invented
you must not have invented
she must not have invented
we must not have invented
you must not have invented
they must not have invented	I must not have been inventing
you must not have been inventing
she must not have been inventing
we must not have been inventing
you must not have been inventing
they must not have been inventing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I invent?
must you invent?
must she invent?
must we invent?
must you invent?
must they invent? 	must I be inventing?
must you be inventing?
must she be inventing?
must we be inventing?
must you be inventing?
must they be inventing? 	must I have invented?
must you have invented?
must she have invented?
must we have invented?
must you have invented?
must they have invented? 	must I have been inventing?
must you have been inventing?
must she have been inventing?
must we have been inventing?
must you have been inventing?
must they have been inventing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not invent?
must you not invent?
must she not invent?
must we not invent?
must you not invent?
must they not invent? 	must I not be inventing?
must you not be inventing?
must she not be inventing?
must we not be inventing?
must you not be inventing?
must they not be inventing? 	must I not have invented?
must you not have invented?
must she not have invented?
must we not have invented?
must you not have invented?
must they not have invented? 	must I not have been inventing?
must you not have been inventing?
must she not have been inventing?
must we not have been inventing?
must you not have been inventing?
must they not have been inventing?