could rock
Regular verb: rock - rocked- rocked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rock
you could rock
he could rock
we could rock
you could rock
they could rock 	I could be rocking
you could be rocking
he could be rocking
we could be rocking
you could be rocking
they could be rocking	I could have rocked
you could have rocked
he could have rocked
we could have rocked
you could have rocked
they could have rocked	I could have been rocking
you could have been rocking
he could have been rocking
we could have been rocking
you could have been rocking
they could have been rocking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't rock
you couldn't rock
he couldn't rock
we couldn't rock
you couldn't rock
they couldn't rock 	I couldn't be rocking
you couldn't be rocking
he couldn't be rocking
we couldn't be rocking
you couldn't be rocking
they couldn't be rocking	I couldn't have rocked
you couldn't have rocked
he couldn't have rocked
we couldn't have rocked
you couldn't have rocked
they couldn't have rocked	I couldn't have been rocking
you couldn't have been rocking
he couldn't have been rocking
we couldn't have been rocking
you couldn't have been rocking
they couldn't have been rocking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rock?
could you rock?
could he rock?
could we rock?
could you rock?
could they rock? 	could I be rocking?
could you be rocking?
could he be rocking?
could we be rocking?
could you be rocking?
could they be rocking? 	could I have rocked?
could you have rocked?
could he have rocked?
could we have rocked?
could you have rocked?
could they have rocked? 	could I have been rocking?
could you have been rocking?
could he have been rocking?
could we have been rocking?
could you have been rocking?
could they have been rocking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I rock?
couldn't you rock?
couldn't he rock?
couldn't we rock?
couldn't you rock?
couldn't they rock? 	couldn't I be rocking?
couldn't you be rocking?
couldn't he be rocking?
couldn't we be rocking?
couldn't you be rocking?
couldn't they be rocking? 	couldn't I have rocked?
couldn't you have rocked?
couldn't he have rocked?
couldn't we have rocked?
couldn't you have rocked?
couldn't they have rocked? 	couldn't I have been rocking?
couldn't you have been rocking?
couldn't he have been rocking?
couldn't we have been rocking?
couldn't you have been rocking?
couldn't they have been rocking?