could articulate
Regular verb: articulate - articulated- articulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could articulate
you could articulate
he could articulate
we could articulate
you could articulate
they could articulate 	I could be articulating
you could be articulating
he could be articulating
we could be articulating
you could be articulating
they could be articulating	I could have articulated
you could have articulated
he could have articulated
we could have articulated
you could have articulated
they could have articulated	I could have been articulating
you could have been articulating
he could have been articulating
we could have been articulating
you could have been articulating
they could have been articulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't articulate
you couldn't articulate
he couldn't articulate
we couldn't articulate
you couldn't articulate
they couldn't articulate 	I couldn't be articulating
you couldn't be articulating
he couldn't be articulating
we couldn't be articulating
you couldn't be articulating
they couldn't be articulating	I couldn't have articulated
you couldn't have articulated
he couldn't have articulated
we couldn't have articulated
you couldn't have articulated
they couldn't have articulated	I couldn't have been articulating
you couldn't have been articulating
he couldn't have been articulating
we couldn't have been articulating
you couldn't have been articulating
they couldn't have been articulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I articulate?
could you articulate?
could he articulate?
could we articulate?
could you articulate?
could they articulate? 	could I be articulating?
could you be articulating?
could he be articulating?
could we be articulating?
could you be articulating?
could they be articulating? 	could I have articulated?
could you have articulated?
could he have articulated?
could we have articulated?
could you have articulated?
could they have articulated? 	could I have been articulating?
could you have been articulating?
could he have been articulating?
could we have been articulating?
could you have been articulating?
could they have been articulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I articulate?
couldn't you articulate?
couldn't he articulate?
couldn't we articulate?
couldn't you articulate?
couldn't they articulate? 	couldn't I be articulating?
couldn't you be articulating?
couldn't he be articulating?
couldn't we be articulating?
couldn't you be articulating?
couldn't they be articulating? 	couldn't I have articulated?
couldn't you have articulated?
couldn't he have articulated?
couldn't we have articulated?
couldn't you have articulated?
couldn't they have articulated? 	couldn't I have been articulating?
couldn't you have been articulating?
couldn't he have been articulating?
couldn't we have been articulating?
couldn't you have been articulating?
couldn't they have been articulating?