English verb conjugation
MUST SKATEBOARD

Regular verb: skateboard - skateboarded - skateboarded

Affirmation

Simple form	V-ing form
I must skateboard you must skateboard he must skateboard we must skateboard you must skateboard they must skateboard	I must be skateboarding you must be skateboarding he 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 he 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 he 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 must not skateboard you must not skateboard he must not skateboard we must not skateboard you must not skateboard they must not skateboard	I must not be skateboarding you must not be skateboarding he must not be skateboarding we must not be skateboarding you must not be skateboarding they must not be skateboarding
Perfect	V-ing perfect
I must not have skateboarded you must not have skateboarded he must not have skateboarded we must not have skateboarded you must not have skateboarded they must not have skateboarded	I must not have been skateboarding you must not have been skateboarding he must not have been skateboarding we must not have been skateboarding you must not have been skateboarding they must not have been skateboarding

Interrogative form

Simple form	V-ing form
must I skateboard? must you skateboard? must he skateboard? must we skateboard? must you skateboard? must they skateboard?	must I be skateboarding? must you be skateboarding? must he 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 he 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 he 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
must I not skateboard? must you not skateboard? must he not skateboard? must we not skateboard? must you not skateboard? must they not skateboard?	must I not be skateboarding? must you not be skateboarding? must he not be skateboarding? must we not be skateboarding? must you not be skateboarding? must they not be skateboarding?
Perfect	V-ing perfect
must I not have skateboarded? must you not have skateboarded? must he not have skateboarded? must we not have skateboarded? must you not have skateboarded? must they not have skateboarded?	must I not have been skateboarding? must you not have been skateboarding? must he not have been skateboarding? must we not have been skateboarding? must you not have been skateboarding? must they not have been skateboarding?