could jerk
Regular verb: jerk - jerked- jerked

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