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