English verb conjugation
COULD JERK

Regular verb: jerk - jerked - jerked

Affirmation

Simple form	V-ing form
I could jerk you could jerk he could jerk we could jerk you could jerk they could jerk	I could be jerking you could be jerking he could be jerking we could be jerking you could be jerking they could be jerking
Perfect	V-ing perfect
I could have jerked you could have jerked he could have jerked we could have jerked you could have jerked they could have jerked	I could have been jerking you could have been jerking he could have been jerking we could have been jerking you could have been jerking they could have been jerking

Negation

Simple form	V-ing form
I couldn't jerk you couldn't jerk he couldn't jerk we couldn't jerk you couldn't jerk they couldn't jerk	I couldn't be jerking you couldn't be jerking he couldn't be jerking we couldn't be jerking you couldn't be jerking they couldn't be jerking
Perfect	V-ing perfect
I couldn't have jerked you couldn't have jerked he couldn't have jerked we couldn't have jerked you couldn't have jerked they couldn't have jerked	I couldn't have been jerking you couldn't have been jerking he couldn't have been jerking we couldn't have been jerking you couldn't have been jerking they couldn't have been jerking

Interrogative form

Simple form	V-ing form
could I jerk? could you jerk? could he jerk? could we jerk? could you jerk? could they jerk?	could I be jerking? could you be jerking? could he be jerking? could we be jerking? could you be jerking? could they be jerking?
Perfect	V-ing perfect
could I have jerked? could you have jerked? could he have jerked? could we have jerked? could you have jerked? could they have jerked?	could I have been jerking? could you have been jerking? could he have been jerking? could we have been jerking? could you have been jerking? could they have been jerking?

Interro-negative form

Simple form	V-ing form
couldn't I jerk? couldn't you jerk? couldn't he jerk? couldn't we jerk? couldn't you jerk? couldn't they jerk?	couldn't I be jerking? couldn't you be jerking? couldn't he be jerking? couldn't we be jerking? couldn't you be jerking? couldn't they be jerking?
Perfect	V-ing perfect
couldn't I have jerked? couldn't you have jerked? couldn't he have jerked? couldn't we have jerked? couldn't you have jerked? couldn't they have jerked?	couldn't I have been jerking? couldn't you have been jerking? couldn't he have been jerking? couldn't we have been jerking? couldn't you have been jerking? couldn't they have been jerking?