must abort
Regular verb: abort - aborted- aborted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must abort
you must abort
he must abort
we must abort
you must abort
they must abort 	I must be aborting
you must be aborting
he must be aborting
we must be aborting
you must be aborting
they must be aborting	I must have aborted
you must have aborted
he must have aborted
we must have aborted
you must have aborted
they must have aborted	I must have been aborting
you must have been aborting
he must have been aborting
we must have been aborting
you must have been aborting
they must have been aborting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't abort
you mustn't abort
he mustn't abort
we mustn't abort
you mustn't abort
they mustn't abort 	I mustn't be aborting
you mustn't be aborting
he mustn't be aborting
we mustn't be aborting
you mustn't be aborting
they mustn't be aborting	I mustn't have aborted
you mustn't have aborted
he mustn't have aborted
we mustn't have aborted
you mustn't have aborted
they mustn't have aborted	I mustn't have been aborting
you mustn't have been aborting
he mustn't have been aborting
we mustn't have been aborting
you mustn't have been aborting
they mustn't have been aborting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I abort?
must you abort?
must he abort?
must we abort?
must you abort?
must they abort? 	must I be aborting?
must you be aborting?
must he be aborting?
must we be aborting?
must you be aborting?
must they be aborting? 	must I have aborted?
must you have aborted?
must he have aborted?
must we have aborted?
must you have aborted?
must they have aborted? 	must I have been aborting?
must you have been aborting?
must he have been aborting?
must we have been aborting?
must you have been aborting?
must they have been aborting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I abort?
mustn't you abort?
mustn't he abort?
mustn't we abort?
mustn't you abort?
mustn't they abort? 	mustn't I be aborting?
mustn't you be aborting?
mustn't he be aborting?
mustn't we be aborting?
mustn't you be aborting?
mustn't they be aborting? 	mustn't I have aborted?
mustn't you have aborted?
mustn't he have aborted?
mustn't we have aborted?
mustn't you have aborted?
mustn't they have aborted? 	mustn't I have been aborting?
mustn't you have been aborting?
mustn't he have been aborting?
mustn't we have been aborting?
mustn't you have been aborting?
mustn't they have been aborting?