must earn
Regular verb: earn - earned- earned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must earn
you must earn
he must earn
we must earn
you must earn
they must earn 	I must be earning
you must be earning
he must be earning
we must be earning
you must be earning
they must be earning	I must have earned
you must have earned
he must have earned
we must have earned
you must have earned
they must have earned	I must have been earning
you must have been earning
he must have been earning
we must have been earning
you must have been earning
they must have been earning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't earn
you mustn't earn
he mustn't earn
we mustn't earn
you mustn't earn
they mustn't earn 	I mustn't be earning
you mustn't be earning
he mustn't be earning
we mustn't be earning
you mustn't be earning
they mustn't be earning	I mustn't have earned
you mustn't have earned
he mustn't have earned
we mustn't have earned
you mustn't have earned
they mustn't have earned	I mustn't have been earning
you mustn't have been earning
he mustn't have been earning
we mustn't have been earning
you mustn't have been earning
they mustn't have been earning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I earn?
must you earn?
must he earn?
must we earn?
must you earn?
must they earn? 	must I be earning?
must you be earning?
must he be earning?
must we be earning?
must you be earning?
must they be earning? 	must I have earned?
must you have earned?
must he have earned?
must we have earned?
must you have earned?
must they have earned? 	must I have been earning?
must you have been earning?
must he have been earning?
must we have been earning?
must you have been earning?
must they have been earning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I earn?
mustn't you earn?
mustn't he earn?
mustn't we earn?
mustn't you earn?
mustn't they earn? 	mustn't I be earning?
mustn't you be earning?
mustn't he be earning?
mustn't we be earning?
mustn't you be earning?
mustn't they be earning? 	mustn't I have earned?
mustn't you have earned?
mustn't he have earned?
mustn't we have earned?
mustn't you have earned?
mustn't they have earned? 	mustn't I have been earning?
mustn't you have been earning?
mustn't he have been earning?
mustn't we have been earning?
mustn't you have been earning?
mustn't they have been earning?