must disk
Regular verb: disk - disked- disked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must disk
you must disk
he must disk
we must disk
you must disk
they must disk 	I must be disking
you must be disking
he must be disking
we must be disking
you must be disking
they must be disking	I must have disked
you must have disked
he 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
he 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 must not disk
you must not disk
he must not disk
we must not disk
you must not disk
they must not disk 	I must not be disking
you must not be disking
he must not be disking
we must not be disking
you must not be disking
they must not be disking	I must not have disked
you must not have disked
he must not have disked
we must not have disked
you must not have disked
they must not have disked	I must not have been disking
you must not have been disking
he must not have been disking
we must not have been disking
you must not have been disking
they must not have been disking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I disk?
must you disk?
must he disk?
must we disk?
must you disk?
must they disk? 	must I be disking?
must you be disking?
must he be disking?
must we be disking?
must you be disking?
must they be disking? 	must I have disked?
must you have disked?
must he 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 he 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 	
must I not disk?
must you not disk?
must he not disk?
must we not disk?
must you not disk?
must they not disk? 	must I not be disking?
must you not be disking?
must he not be disking?
must we not be disking?
must you not be disking?
must they not be disking? 	must I not have disked?
must you not have disked?
must he not have disked?
must we not have disked?
must you not have disked?
must they not have disked? 	must I not have been disking?
must you not have been disking?
must he not have been disking?
must we not have been disking?
must you not have been disking?
must they not have been disking?