English verb conjugation
MUST LEARN

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

Affirmation

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