English verb conjugation
MUST SKETCH

Regular verb: sketch - sketched - sketched

Affirmation

Simple form	V-ing form
I must sketch you must sketch he must sketch we must sketch you must sketch they must sketch	I must be sketching you must be sketching he must be sketching we must be sketching you must be sketching they must be sketching
Perfect	V-ing perfect
I must have sketched you must have sketched he must have sketched we must have sketched you must have sketched they must have sketched	I must have been sketching you must have been sketching he must have been sketching we must have been sketching you must have been sketching they must have been sketching

Negation

Simple form	V-ing form
I mustn't sketch you mustn't sketch he mustn't sketch we mustn't sketch you mustn't sketch they mustn't sketch	I mustn't be sketching you mustn't be sketching he mustn't be sketching we mustn't be sketching you mustn't be sketching they mustn't be sketching
Perfect	V-ing perfect
I mustn't have sketched you mustn't have sketched he mustn't have sketched we mustn't have sketched you mustn't have sketched they mustn't have sketched	I mustn't have been sketching you mustn't have been sketching he mustn't have been sketching we mustn't have been sketching you mustn't have been sketching they mustn't have been sketching

Interrogative form

Simple form	V-ing form
must I sketch? must you sketch? must he sketch? must we sketch? must you sketch? must they sketch?	must I be sketching? must you be sketching? must he be sketching? must we be sketching? must you be sketching? must they be sketching?
Perfect	V-ing perfect
must I have sketched? must you have sketched? must he have sketched? must we have sketched? must you have sketched? must they have sketched?	must I have been sketching? must you have been sketching? must he have been sketching? must we have been sketching? must you have been sketching? must they have been sketching?

Interro-negative form

Simple form	V-ing form
mustn't I sketch? mustn't you sketch? mustn't he sketch? mustn't we sketch? mustn't you sketch? mustn't they sketch?	mustn't I be sketching? mustn't you be sketching? mustn't he be sketching? mustn't we be sketching? mustn't you be sketching? mustn't they be sketching?
Perfect	V-ing perfect
mustn't I have sketched? mustn't you have sketched? mustn't he have sketched? mustn't we have sketched? mustn't you have sketched? mustn't they have sketched?	mustn't I have been sketching? mustn't you have been sketching? mustn't he have been sketching? mustn't we have been sketching? mustn't you have been sketching? mustn't they have been sketching?