should invent
Regular verb: invent - invented- invented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd invent
you'd invent
she'd invent
we'd invent
you'd invent
they'd invent 	I'd be inventing
you'd be inventing
she'd be inventing
we'd be inventing
you'd be inventing
they'd be inventing	I should've invented
you should've invented
she should've invented
we should've invented
you should've invented
they should've invented	I should've been inventing
you should've been inventing
she should've been inventing
we should've been inventing
you should've been inventing
they should've been inventing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't invent
you shouldn't invent
she shouldn't invent
we shouldn't invent
you shouldn't invent
they shouldn't invent 	I shouldn't be inventing
you shouldn't be inventing
she shouldn't be inventing
we shouldn't be inventing
you shouldn't be inventing
they shouldn't be inventing	I shouldn't have invented
you shouldn't have invented
she shouldn't have invented
we shouldn't have invented
you shouldn't have invented
they shouldn't have invented	I shouldn't have been inventing
you shouldn't have been inventing
she shouldn't have been inventing
we shouldn't have been inventing
you shouldn't have been inventing
they shouldn't have been inventing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I invent?
should you invent?
should she invent?
should we invent?
should you invent?
should they invent? 	should I be inventing?
should you be inventing?
should she be inventing?
should we be inventing?
should you be inventing?
should they be inventing? 	should I have invented?
should you have invented?
should she have invented?
should we have invented?
should you have invented?
should they have invented? 	should I have been inventing?
should you have been inventing?
should she have been inventing?
should we have been inventing?
should you have been inventing?
should they have been inventing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I invent?
shouldn't you invent?
shouldn't she invent?
shouldn't we invent?
shouldn't you invent?
shouldn't they invent? 	shouldn't I be inventing?
shouldn't you be inventing?
shouldn't she be inventing?
shouldn't we be inventing?
shouldn't you be inventing?
shouldn't they be inventing? 	shouldn't I have invented?
shouldn't you have invented?
shouldn't she have invented?
shouldn't we have invented?
shouldn't you have invented?
shouldn't they have invented? 	shouldn't I have been inventing?
shouldn't you have been inventing?
shouldn't she have been inventing?
shouldn't we have been inventing?
shouldn't you have been inventing?
shouldn't they have been inventing?