English verb conjugation
MUST SURFBOARD

Regular verb: surfboard - surfboarded - surfboarded

Affirmation

Simple form	V-ing form
I must surfboard you must surfboard he must surfboard we must surfboard you must surfboard they must surfboard	I must be surfboarding you must be surfboarding he must be surfboarding we must be surfboarding you must be surfboarding they must be surfboarding
Perfect	V-ing perfect
I must have surfboarded you must have surfboarded he must have surfboarded we must have surfboarded you must have surfboarded they must have surfboarded	I must have been surfboarding you must have been surfboarding he must have been surfboarding we must have been surfboarding you must have been surfboarding they must have been surfboarding

Negation

Simple form	V-ing form
I must not surfboard you must not surfboard he must not surfboard we must not surfboard you must not surfboard they must not surfboard	I must not be surfboarding you must not be surfboarding he must not be surfboarding we must not be surfboarding you must not be surfboarding they must not be surfboarding
Perfect	V-ing perfect
I must not have surfboarded you must not have surfboarded he must not have surfboarded we must not have surfboarded you must not have surfboarded they must not have surfboarded	I must not have been surfboarding you must not have been surfboarding he must not have been surfboarding we must not have been surfboarding you must not have been surfboarding they must not have been surfboarding

Interrogative form

Simple form	V-ing form
must I surfboard? must you surfboard? must he surfboard? must we surfboard? must you surfboard? must they surfboard?	must I be surfboarding? must you be surfboarding? must he be surfboarding? must we be surfboarding? must you be surfboarding? must they be surfboarding?
Perfect	V-ing perfect
must I have surfboarded? must you have surfboarded? must he have surfboarded? must we have surfboarded? must you have surfboarded? must they have surfboarded?	must I have been surfboarding? must you have been surfboarding? must he have been surfboarding? must we have been surfboarding? must you have been surfboarding? must they have been surfboarding?

Interro-negative form

Simple form	V-ing form
must I not surfboard? must you not surfboard? must he not surfboard? must we not surfboard? must you not surfboard? must they not surfboard?	must I not be surfboarding? must you not be surfboarding? must he not be surfboarding? must we not be surfboarding? must you not be surfboarding? must they not be surfboarding?
Perfect	V-ing perfect
must I not have surfboarded? must you not have surfboarded? must he not have surfboarded? must we not have surfboarded? must you not have surfboarded? must they not have surfboarded?	must I not have been surfboarding? must you not have been surfboarding? must he not have been surfboarding? must we not have been surfboarding? must you not have been surfboarding? must they not have been surfboarding?