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