must disk
Regular verb: disk - disked- disked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must disk
you must disk
she must disk
we must disk
you must disk
they must disk 	I must be disking
you must be disking
she must be disking
we must be disking
you must be disking
they must be disking	I must have disked
you must have disked
she must have disked
we must have disked
you must have disked
they must have disked	I must have been disking
you must have been disking
she must have been disking
we must have been disking
you must have been disking
they must have been disking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't disk
you mustn't disk
she mustn't disk
we mustn't disk
you mustn't disk
they mustn't disk 	I mustn't be disking
you mustn't be disking
she mustn't be disking
we mustn't be disking
you mustn't be disking
they mustn't be disking	I mustn't have disked
you mustn't have disked
she mustn't have disked
we mustn't have disked
you mustn't have disked
they mustn't have disked	I mustn't have been disking
you mustn't have been disking
she mustn't have been disking
we mustn't have been disking
you mustn't have been disking
they mustn't have been disking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I disk?
must you disk?
must she disk?
must we disk?
must you disk?
must they disk? 	must I be disking?
must you be disking?
must she be disking?
must we be disking?
must you be disking?
must they be disking? 	must I have disked?
must you have disked?
must she have disked?
must we have disked?
must you have disked?
must they have disked? 	must I have been disking?
must you have been disking?
must she have been disking?
must we have been disking?
must you have been disking?
must they have been disking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I disk?
mustn't you disk?
mustn't she disk?
mustn't we disk?
mustn't you disk?
mustn't they disk? 	mustn't I be disking?
mustn't you be disking?
mustn't she be disking?
mustn't we be disking?
mustn't you be disking?
mustn't they be disking? 	mustn't I have disked?
mustn't you have disked?
mustn't she have disked?
mustn't we have disked?
mustn't you have disked?
mustn't they have disked? 	mustn't I have been disking?
mustn't you have been disking?
mustn't she have been disking?
mustn't we have been disking?
mustn't you have been disking?
mustn't they have been disking?