could top
Regular verb: top - topped- topped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could top
you could top
he could top
we could top
you could top
they could top 	I could be topping
you could be topping
he could be topping
we could be topping
you could be topping
they could be topping	I could have topped
you could have topped
he could have topped
we could have topped
you could have topped
they could have topped	I could have been topping
you could have been topping
he could have been topping
we could have been topping
you could have been topping
they could have been topping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't top
you couldn't top
he couldn't top
we couldn't top
you couldn't top
they couldn't top 	I couldn't be topping
you couldn't be topping
he couldn't be topping
we couldn't be topping
you couldn't be topping
they couldn't be topping	I couldn't have topped
you couldn't have topped
he couldn't have topped
we couldn't have topped
you couldn't have topped
they couldn't have topped	I couldn't have been topping
you couldn't have been topping
he couldn't have been topping
we couldn't have been topping
you couldn't have been topping
they couldn't have been topping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I top?
could you top?
could he top?
could we top?
could you top?
could they top? 	could I be topping?
could you be topping?
could he be topping?
could we be topping?
could you be topping?
could they be topping? 	could I have topped?
could you have topped?
could he have topped?
could we have topped?
could you have topped?
could they have topped? 	could I have been topping?
could you have been topping?
could he have been topping?
could we have been topping?
could you have been topping?
could they have been topping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I top?
couldn't you top?
couldn't he top?
couldn't we top?
couldn't you top?
couldn't they top? 	couldn't I be topping?
couldn't you be topping?
couldn't he be topping?
couldn't we be topping?
couldn't you be topping?
couldn't they be topping? 	couldn't I have topped?
couldn't you have topped?
couldn't he have topped?
couldn't we have topped?
couldn't you have topped?
couldn't they have topped? 	couldn't I have been topping?
couldn't you have been topping?
couldn't he have been topping?
couldn't we have been topping?
couldn't you have been topping?
couldn't they have been topping?