English verb conjugation
MUST LESSON

Regular verb: lesson - lessoned - lessoned

Affirmation

Simple form	V-ing form
I must lesson you must lesson he must lesson we must lesson you must lesson they must lesson	I must be lessoning you must be lessoning he must be lessoning we must be lessoning you must be lessoning they must be lessoning
Perfect	V-ing perfect
I must have lessoned you must have lessoned he must have lessoned we must have lessoned you must have lessoned they must have lessoned	I must have been lessoning you must have been lessoning he must have been lessoning we must have been lessoning you must have been lessoning they must have been lessoning

Negation

Simple form	V-ing form
I mustn't lesson you mustn't lesson he mustn't lesson we mustn't lesson you mustn't lesson they mustn't lesson	I mustn't be lessoning you mustn't be lessoning he mustn't be lessoning we mustn't be lessoning you mustn't be lessoning they mustn't be lessoning
Perfect	V-ing perfect
I mustn't have lessoned you mustn't have lessoned he mustn't have lessoned we mustn't have lessoned you mustn't have lessoned they mustn't have lessoned	I mustn't have been lessoning you mustn't have been lessoning he mustn't have been lessoning we mustn't have been lessoning you mustn't have been lessoning they mustn't have been lessoning

Interrogative form

Simple form	V-ing form
must I lesson? must you lesson? must he lesson? must we lesson? must you lesson? must they lesson?	must I be lessoning? must you be lessoning? must he be lessoning? must we be lessoning? must you be lessoning? must they be lessoning?
Perfect	V-ing perfect
must I have lessoned? must you have lessoned? must he have lessoned? must we have lessoned? must you have lessoned? must they have lessoned?	must I have been lessoning? must you have been lessoning? must he have been lessoning? must we have been lessoning? must you have been lessoning? must they have been lessoning?

Interro-negative form

Simple form	V-ing form
mustn't I lesson? mustn't you lesson? mustn't he lesson? mustn't we lesson? mustn't you lesson? mustn't they lesson?	mustn't I be lessoning? mustn't you be lessoning? mustn't he be lessoning? mustn't we be lessoning? mustn't you be lessoning? mustn't they be lessoning?
Perfect	V-ing perfect
mustn't I have lessoned? mustn't you have lessoned? mustn't he have lessoned? mustn't we have lessoned? mustn't you have lessoned? mustn't they have lessoned?	mustn't I have been lessoning? mustn't you have been lessoning? mustn't he have been lessoning? mustn't we have been lessoning? mustn't you have been lessoning? mustn't they have been lessoning?