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 must not invert
you must not invert
she must not invert
we must not invert
you must not invert
they must not invert 	I must not be inverting
you must not be inverting
she must not be inverting
we must not be inverting
you must not be inverting
they must not be inverting	I must not have inverted
you must not have inverted
she must not have inverted
we must not have inverted
you must not have inverted
they must not have inverted	I must not have been inverting
you must not have been inverting
she must not have been inverting
we must not have been inverting
you must not have been inverting
they must not 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 	
must I not invert?
must you not invert?
must she not invert?
must we not invert?
must you not invert?
must they not invert? 	must I not be inverting?
must you not be inverting?
must she not be inverting?
must we not be inverting?
must you not be inverting?
must they not be inverting? 	must I not have inverted?
must you not have inverted?
must she not have inverted?
must we not have inverted?
must you not have inverted?
must they not have inverted? 	must I not have been inverting?
must you not have been inverting?
must she not have been inverting?
must we not have been inverting?
must you not have been inverting?
must they not have been inverting?