English verb conjugation
MUST DISC

Regular verb: disc - disced - disced

Affirmation

Simple form	V-ing form
I must disc you must disc she must disc we must disc you must disc they must disc	I must be discing you must be discing she must be discing we must be discing you must be discing they must be discing
Perfect	V-ing perfect
I must have disced you must have disced she must have disced we must have disced you must have disced they must have disced	I must have been discing you must have been discing she must have been discing we must have been discing you must have been discing they must have been discing

Negation

Simple form	V-ing form
I mustn't disc you mustn't disc she mustn't disc we mustn't disc you mustn't disc they mustn't disc	I mustn't be discing you mustn't be discing she mustn't be discing we mustn't be discing you mustn't be discing they mustn't be discing
Perfect	V-ing perfect
I mustn't have disced you mustn't have disced she mustn't have disced we mustn't have disced you mustn't have disced they mustn't have disced	I mustn't have been discing you mustn't have been discing she mustn't have been discing we mustn't have been discing you mustn't have been discing they mustn't have been discing

Interrogative form

Simple form	V-ing form
must I disc? must you disc? must she disc? must we disc? must you disc? must they disc?	must I be discing? must you be discing? must she be discing? must we be discing? must you be discing? must they be discing?
Perfect	V-ing perfect
must I have disced? must you have disced? must she have disced? must we have disced? must you have disced? must they have disced?	must I have been discing? must you have been discing? must she have been discing? must we have been discing? must you have been discing? must they have been discing?

Interro-negative form

Simple form	V-ing form
mustn't I disc? mustn't you disc? mustn't she disc? mustn't we disc? mustn't you disc? mustn't they disc?	mustn't I be discing? mustn't you be discing? mustn't she be discing? mustn't we be discing? mustn't you be discing? mustn't they be discing?
Perfect	V-ing perfect
mustn't I have disced? mustn't you have disced? mustn't she have disced? mustn't we have disced? mustn't you have disced? mustn't they have disced?	mustn't I have been discing? mustn't you have been discing? mustn't she have been discing? mustn't we have been discing? mustn't you have been discing? mustn't they have been discing?