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 mustn't spark you mustn't spark he mustn't spark we mustn't spark you mustn't spark they mustn't spark	I mustn't be sparking you mustn't be sparking he mustn't be sparking we mustn't be sparking you mustn't be sparking they mustn't be sparking
Perfect	V-ing perfect
I mustn't have sparked you mustn't have sparked he mustn't have sparked we mustn't have sparked you mustn't have sparked they mustn't have sparked	I mustn't have been sparking you mustn't have been sparking he mustn't have been sparking we mustn't have been sparking you mustn't have been sparking they mustn't 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
mustn't I spark? mustn't you spark? mustn't he spark? mustn't we spark? mustn't you spark? mustn't they spark?	mustn't I be sparking? mustn't you be sparking? mustn't he be sparking? mustn't we be sparking? mustn't you be sparking? mustn't they be sparking?
Perfect	V-ing perfect
mustn't I have sparked? mustn't you have sparked? mustn't he have sparked? mustn't we have sparked? mustn't you have sparked? mustn't they have sparked?	mustn't I have been sparking? mustn't you have been sparking? mustn't he have been sparking? mustn't we have been sparking? mustn't you have been sparking? mustn't they have been sparking?