English verb conjugation
MUST SPARK

Regular verb: spark - sparked - sparked

Affirmation

Simple form	V-ing form
I must spark you must spark he must spark we must spark you must spark they must spark	I must be sparking you must be sparking he must be sparking we must be sparking you must be sparking they must be sparking
Perfect	V-ing perfect
I must have sparked you must have sparked he must have sparked we must have sparked you must have sparked they must have sparked	I must have been sparking you must have been sparking he must have been sparking we must have been sparking you must have been sparking they must have been sparking

Negation

Simple form	V-ing form
I must not spark you must not spark he must not spark we must not spark you must not spark they must not spark	I must not be sparking you must not be sparking he must not be sparking we must not be sparking you must not be sparking they must not be sparking
Perfect	V-ing perfect
I must not have sparked you must not have sparked he must not have sparked we must not have sparked you must not have sparked they must not have sparked	I must not have been sparking you must not have been sparking he must not have been sparking we must not have been sparking you must not have been sparking they must not have been sparking

Interrogative form

Simple form	V-ing form
must I spark? must you spark? must he spark? must we spark? must you spark? must they spark?	must I be sparking? must you be sparking? must he be sparking? must we be sparking? must you be sparking? must they be sparking?
Perfect	V-ing perfect
must I have sparked? must you have sparked? must he have sparked? must we have sparked? must you have sparked? must they have sparked?	must I have been sparking? must you have been sparking? must he have been sparking? must we have been sparking? must you have been sparking? must they have been sparking?

Interro-negative form

Simple form	V-ing form
must I not spark? must you not spark? must he not spark? must we not spark? must you not spark? must they not spark?	must I not be sparking? must you not be sparking? must he not be sparking? must we not be sparking? must you not be sparking? must they not be sparking?
Perfect	V-ing perfect
must I not have sparked? must you not have sparked? must he not have sparked? must we not have sparked? must you not have sparked? must they not have sparked?	must I not have been sparking? must you not have been sparking? must he not have been sparking? must we not have been sparking? must you not have been sparking? must they not have been sparking?