must sketch
Regular verb: sketch - sketched- sketched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?