English verb conjugation
CAN INVENT

Regular verb: invent - invented - invented

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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