English verb conjugation
MUST SKATEBOARD

Regular verb: skateboard - skateboarded - skateboarded

Affirmation

Simple form	V-ing form
I must skateboard you must skateboard she must skateboard we must skateboard you must skateboard they must skateboard	I must be skateboarding you must be skateboarding she must be skateboarding we must be skateboarding you must be skateboarding they must be skateboarding
Perfect	V-ing perfect
I must have skateboarded you must have skateboarded she must have skateboarded we must have skateboarded you must have skateboarded they must have skateboarded	I must have been skateboarding you must have been skateboarding she must have been skateboarding we must have been skateboarding you must have been skateboarding they must have been skateboarding

Negation

Simple form	V-ing form
I mustn't skateboard you mustn't skateboard she mustn't skateboard we mustn't skateboard you mustn't skateboard they mustn't skateboard	I mustn't be skateboarding you mustn't be skateboarding she mustn't be skateboarding we mustn't be skateboarding you mustn't be skateboarding they mustn't be skateboarding
Perfect	V-ing perfect
I mustn't have skateboarded you mustn't have skateboarded she mustn't have skateboarded we mustn't have skateboarded you mustn't have skateboarded they mustn't have skateboarded	I mustn't have been skateboarding you mustn't have been skateboarding she mustn't have been skateboarding we mustn't have been skateboarding you mustn't have been skateboarding they mustn't have been skateboarding

Interrogative form

Simple form	V-ing form
must I skateboard? must you skateboard? must she skateboard? must we skateboard? must you skateboard? must they skateboard?	must I be skateboarding? must you be skateboarding? must she be skateboarding? must we be skateboarding? must you be skateboarding? must they be skateboarding?
Perfect	V-ing perfect
must I have skateboarded? must you have skateboarded? must she have skateboarded? must we have skateboarded? must you have skateboarded? must they have skateboarded?	must I have been skateboarding? must you have been skateboarding? must she have been skateboarding? must we have been skateboarding? must you have been skateboarding? must they have been skateboarding?

Interro-negative form

Simple form	V-ing form
mustn't I skateboard? mustn't you skateboard? mustn't she skateboard? mustn't we skateboard? mustn't you skateboard? mustn't they skateboard?	mustn't I be skateboarding? mustn't you be skateboarding? mustn't she be skateboarding? mustn't we be skateboarding? mustn't you be skateboarding? mustn't they be skateboarding?
Perfect	V-ing perfect
mustn't I have skateboarded? mustn't you have skateboarded? mustn't she have skateboarded? mustn't we have skateboarded? mustn't you have skateboarded? mustn't they have skateboarded?	mustn't I have been skateboarding? mustn't you have been skateboarding? mustn't she have been skateboarding? mustn't we have been skateboarding? mustn't you have been skateboarding? mustn't they have been skateboarding?