English verb conjugation
COULD SPARK

Regular verb: spark - sparked - sparked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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