English verb conjugation
COULD PRANK

Regular verb: prank - pranked - pranked

Affirmation

Simple form	V-ing form
I could prank you could prank he could prank we could prank you could prank they could prank	I could be pranking you could be pranking he could be pranking we could be pranking you could be pranking they could be pranking
Perfect	V-ing perfect
I could have pranked you could have pranked he could have pranked we could have pranked you could have pranked they could have pranked	I could have been pranking you could have been pranking he could have been pranking we could have been pranking you could have been pranking they could have been pranking

Negation

Simple form	V-ing form
I couldn't prank you couldn't prank he couldn't prank we couldn't prank you couldn't prank they couldn't prank	I couldn't be pranking you couldn't be pranking he couldn't be pranking we couldn't be pranking you couldn't be pranking they couldn't be pranking
Perfect	V-ing perfect
I couldn't have pranked you couldn't have pranked he couldn't have pranked we couldn't have pranked you couldn't have pranked they couldn't have pranked	I couldn't have been pranking you couldn't have been pranking he couldn't have been pranking we couldn't have been pranking you couldn't have been pranking they couldn't have been pranking

Interrogative form

Simple form	V-ing form
could I prank? could you prank? could he prank? could we prank? could you prank? could they prank?	could I be pranking? could you be pranking? could he be pranking? could we be pranking? could you be pranking? could they be pranking?
Perfect	V-ing perfect
could I have pranked? could you have pranked? could he have pranked? could we have pranked? could you have pranked? could they have pranked?	could I have been pranking? could you have been pranking? could he have been pranking? could we have been pranking? could you have been pranking? could they have been pranking?

Interro-negative form

Simple form	V-ing form
couldn't I prank? couldn't you prank? couldn't he prank? couldn't we prank? couldn't you prank? couldn't they prank?	couldn't I be pranking? couldn't you be pranking? couldn't he be pranking? couldn't we be pranking? couldn't you be pranking? couldn't they be pranking?
Perfect	V-ing perfect
couldn't I have pranked? couldn't you have pranked? couldn't he have pranked? couldn't we have pranked? couldn't you have pranked? couldn't they have pranked?	couldn't I have been pranking? couldn't you have been pranking? couldn't he have been pranking? couldn't we have been pranking? couldn't you have been pranking? couldn't they have been pranking?