English verb conjugation
MUST ROLLER-SKATE

Regular verb: roller-skate - roller-skated - roller-skated

Affirmation

Simple form	V-ing form
I must roller-skate you must roller-skate he must roller-skate we must roller-skate you must roller-skate they must roller-skate	I must be roller-skating you must be roller-skating he must be roller-skating we must be roller-skating you must be roller-skating they must be roller-skating
Perfect	V-ing perfect
I must have roller-skated you must have roller-skated he must have roller-skated we must have roller-skated you must have roller-skated they must have roller-skated	I must have been roller-skating you must have been roller-skating he must have been roller-skating we must have been roller-skating you must have been roller-skating they must have been roller-skating

Negation

Simple form	V-ing form
I mustn't roller-skate you mustn't roller-skate he mustn't roller-skate we mustn't roller-skate you mustn't roller-skate they mustn't roller-skate	I mustn't be roller-skating you mustn't be roller-skating he mustn't be roller-skating we mustn't be roller-skating you mustn't be roller-skating they mustn't be roller-skating
Perfect	V-ing perfect
I mustn't have roller-skated you mustn't have roller-skated he mustn't have roller-skated we mustn't have roller-skated you mustn't have roller-skated they mustn't have roller-skated	I mustn't have been roller-skating you mustn't have been roller-skating he mustn't have been roller-skating we mustn't have been roller-skating you mustn't have been roller-skating they mustn't have been roller-skating

Interrogative form

Simple form	V-ing form
must I roller-skate? must you roller-skate? must he roller-skate? must we roller-skate? must you roller-skate? must they roller-skate?	must I be roller-skating? must you be roller-skating? must he be roller-skating? must we be roller-skating? must you be roller-skating? must they be roller-skating?
Perfect	V-ing perfect
must I have roller-skated? must you have roller-skated? must he have roller-skated? must we have roller-skated? must you have roller-skated? must they have roller-skated?	must I have been roller-skating? must you have been roller-skating? must he have been roller-skating? must we have been roller-skating? must you have been roller-skating? must they have been roller-skating?

Interro-negative form

Simple form	V-ing form
mustn't I roller-skate? mustn't you roller-skate? mustn't he roller-skate? mustn't we roller-skate? mustn't you roller-skate? mustn't they roller-skate?	mustn't I be roller-skating? mustn't you be roller-skating? mustn't he be roller-skating? mustn't we be roller-skating? mustn't you be roller-skating? mustn't they be roller-skating?
Perfect	V-ing perfect
mustn't I have roller-skated? mustn't you have roller-skated? mustn't he have roller-skated? mustn't we have roller-skated? mustn't you have roller-skated? mustn't they have roller-skated?	mustn't I have been roller-skating? mustn't you have been roller-skating? mustn't he have been roller-skating? mustn't we have been roller-skating? mustn't you have been roller-skating? mustn't they have been roller-skating?