English verb conjugation
MUST MARBLE

Regular verb: marble - marbled - marbled

Affirmation

Simple form	V-ing form
I must marble you must marble he must marble we must marble you must marble they must marble	I must be marbling you must be marbling he must be marbling we must be marbling you must be marbling they must be marbling
Perfect	V-ing perfect
I must have marbled you must have marbled he must have marbled we must have marbled you must have marbled they must have marbled	I must have been marbling you must have been marbling he must have been marbling we must have been marbling you must have been marbling they must have been marbling

Negation

Simple form	V-ing form
I must not marble you must not marble he must not marble we must not marble you must not marble they must not marble	I must not be marbling you must not be marbling he must not be marbling we must not be marbling you must not be marbling they must not be marbling
Perfect	V-ing perfect
I must not have marbled you must not have marbled he must not have marbled we must not have marbled you must not have marbled they must not have marbled	I must not have been marbling you must not have been marbling he must not have been marbling we must not have been marbling you must not have been marbling they must not have been marbling

Interrogative form

Simple form	V-ing form
must I marble? must you marble? must he marble? must we marble? must you marble? must they marble?	must I be marbling? must you be marbling? must he be marbling? must we be marbling? must you be marbling? must they be marbling?
Perfect	V-ing perfect
must I have marbled? must you have marbled? must he have marbled? must we have marbled? must you have marbled? must they have marbled?	must I have been marbling? must you have been marbling? must he have been marbling? must we have been marbling? must you have been marbling? must they have been marbling?

Interro-negative form

Simple form	V-ing form
must I not marble? must you not marble? must he not marble? must we not marble? must you not marble? must they not marble?	must I not be marbling? must you not be marbling? must he not be marbling? must we not be marbling? must you not be marbling? must they not be marbling?
Perfect	V-ing perfect
must I not have marbled? must you not have marbled? must he not have marbled? must we not have marbled? must you not have marbled? must they not have marbled?	must I not have been marbling? must you not have been marbling? must he not have been marbling? must we not have been marbling? must you not have been marbling? must they not have been marbling?