must invert
Regular verb: invert - inverted- inverted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must invert
you must invert
she must invert
we must invert
you must invert
they must invert 	I must be inverting
you must be inverting
she must be inverting
we must be inverting
you must be inverting
they must be inverting	I must have inverted
you must have inverted
she must have inverted
we must have inverted
you must have inverted
they must have inverted	I must have been inverting
you must have been inverting
she must have been inverting
we must have been inverting
you must have been inverting
they must have been inverting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't invert
you mustn't invert
she mustn't invert
we mustn't invert
you mustn't invert
they mustn't invert 	I mustn't be inverting
you mustn't be inverting
she mustn't be inverting
we mustn't be inverting
you mustn't be inverting
they mustn't be inverting	I mustn't have inverted
you mustn't have inverted
she mustn't have inverted
we mustn't have inverted
you mustn't have inverted
they mustn't have inverted	I mustn't have been inverting
you mustn't have been inverting
she mustn't have been inverting
we mustn't have been inverting
you mustn't have been inverting
they mustn't have been inverting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I invert?
must you invert?
must she invert?
must we invert?
must you invert?
must they invert? 	must I be inverting?
must you be inverting?
must she be inverting?
must we be inverting?
must you be inverting?
must they be inverting? 	must I have inverted?
must you have inverted?
must she have inverted?
must we have inverted?
must you have inverted?
must they have inverted? 	must I have been inverting?
must you have been inverting?
must she have been inverting?
must we have been inverting?
must you have been inverting?
must they have been inverting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I invert?
mustn't you invert?
mustn't she invert?
mustn't we invert?
mustn't you invert?
mustn't they invert? 	mustn't I be inverting?
mustn't you be inverting?
mustn't she be inverting?
mustn't we be inverting?
mustn't you be inverting?
mustn't they be inverting? 	mustn't I have inverted?
mustn't you have inverted?
mustn't she have inverted?
mustn't we have inverted?
mustn't you have inverted?
mustn't they have inverted? 	mustn't I have been inverting?
mustn't you have been inverting?
mustn't she have been inverting?
mustn't we have been inverting?
mustn't you have been inverting?
mustn't they have been inverting?