must learn
Irregular verb: learn - learned, learnt- learned, learnt

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must learn
you must learn
she must learn
we must learn
you must learn
they must learn 	I must be learning
you must be learning
she must be learning
we must be learning
you must be learning
they must be learning	I must have learned, learnt
you must have learned, learnt
she must have learned, learnt
we must have learned, learnt
you must have learned, learnt
they must have learned, learnt	I must have been learning
you must have been learning
she must have been learning
we must have been learning
you must have been learning
they must have been learning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't learn
you mustn't learn
she mustn't learn
we mustn't learn
you mustn't learn
they mustn't learn 	I mustn't be learning
you mustn't be learning
she mustn't be learning
we mustn't be learning
you mustn't be learning
they mustn't be learning	I mustn't have learned, learnt
you mustn't have learned, learnt
she mustn't have learned, learnt
we mustn't have learned, learnt
you mustn't have learned, learnt
they mustn't have learned, learnt	I mustn't have been learning
you mustn't have been learning
she mustn't have been learning
we mustn't have been learning
you mustn't have been learning
they mustn't have been learning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I learn?
must you learn?
must she learn?
must we learn?
must you learn?
must they learn? 	must I be learning?
must you be learning?
must she be learning?
must we be learning?
must you be learning?
must they be learning? 	must I have learned, learnt?
must you have learned, learnt?
must she have learned, learnt?
must we have learned, learnt?
must you have learned, learnt?
must they have learned, learnt? 	must I have been learning?
must you have been learning?
must she have been learning?
must we have been learning?
must you have been learning?
must they have been learning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I learn?
mustn't you learn?
mustn't she learn?
mustn't we learn?
mustn't you learn?
mustn't they learn? 	mustn't I be learning?
mustn't you be learning?
mustn't she be learning?
mustn't we be learning?
mustn't you be learning?
mustn't they be learning? 	mustn't I have learned, learnt?
mustn't you have learned, learnt?
mustn't she have learned, learnt?
mustn't we have learned, learnt?
mustn't you have learned, learnt?
mustn't they have learned, learnt? 	mustn't I have been learning?
mustn't you have been learning?
mustn't she have been learning?
mustn't we have been learning?
mustn't you have been learning?
mustn't they have been learning?