English verb conjugation
MUST INVENT

Regular verb: invent - invented - invented

Affirmation

Simple form	V-ing form
I must invent you must invent he must invent we must invent you must invent they must invent	I must be inventing you must be inventing he must be inventing we must be inventing you must be inventing they must be inventing
Perfect	V-ing perfect
I must have invented you must have invented he 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 he must have been inventing we must have been inventing you must have been inventing they must have been inventing

Negation

Simple form	V-ing form
I mustn't invent you mustn't invent he mustn't invent we mustn't invent you mustn't invent they mustn't invent	I mustn't be inventing you mustn't be inventing he mustn't be inventing we mustn't be inventing you mustn't be inventing they mustn't be inventing
Perfect	V-ing perfect
I mustn't have invented you mustn't have invented he mustn't have invented we mustn't have invented you mustn't have invented they mustn't have invented	I mustn't have been inventing you mustn't have been inventing he mustn't have been inventing we mustn't have been inventing you mustn't have been inventing they mustn't have been inventing

Interrogative form

Simple form	V-ing form
must I invent? must you invent? must he invent? must we invent? must you invent? must they invent?	must I be inventing? must you be inventing? must he be inventing? must we be inventing? must you be inventing? must they be inventing?
Perfect	V-ing perfect
must I have invented? must you have invented? must he 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 he have been inventing? must we have been inventing? must you have been inventing? must they have been inventing?

Interro-negative form

Simple form	V-ing form
mustn't I invent? mustn't you invent? mustn't he invent? mustn't we invent? mustn't you invent? mustn't they invent?	mustn't I be inventing? mustn't you be inventing? mustn't he be inventing? mustn't we be inventing? mustn't you be inventing? mustn't they be inventing?
Perfect	V-ing perfect
mustn't I have invented? mustn't you have invented? mustn't he have invented? mustn't we have invented? mustn't you have invented? mustn't they have invented?	mustn't I have been inventing? mustn't you have been inventing? mustn't he have been inventing? mustn't we have been inventing? mustn't you have been inventing? mustn't they have been inventing?