could formulate
Verbo regular: formulate - formulated- formulated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could formulate
you could formulate
he could formulate
we could formulate
you could formulate
they could formulate 	I could be formulating
you could be formulating
he could be formulating
we could be formulating
you could be formulating
they could be formulating	I could have formulated
you could have formulated
he could have formulated
we could have formulated
you could have formulated
they could have formulated	I could have been formulating
you could have been formulating
he could have been formulating
we could have been formulating
you could have been formulating
they could have been formulating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't formulate
you couldn't formulate
he couldn't formulate
we couldn't formulate
you couldn't formulate
they couldn't formulate 	I couldn't be formulating
you couldn't be formulating
he couldn't be formulating
we couldn't be formulating
you couldn't be formulating
they couldn't be formulating	I couldn't have formulated
you couldn't have formulated
he couldn't have formulated
we couldn't have formulated
you couldn't have formulated
they couldn't have formulated	I couldn't have been formulating
you couldn't have been formulating
he couldn't have been formulating
we couldn't have been formulating
you couldn't have been formulating
they couldn't have been formulating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I formulate?
could you formulate?
could he formulate?
could we formulate?
could you formulate?
could they formulate? 	could I be formulating?
could you be formulating?
could he be formulating?
could we be formulating?
could you be formulating?
could they be formulating? 	could I have formulated?
could you have formulated?
could he have formulated?
could we have formulated?
could you have formulated?
could they have formulated? 	could I have been formulating?
could you have been formulating?
could he have been formulating?
could we have been formulating?
could you have been formulating?
could they have been formulating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I formulate?
couldn't you formulate?
couldn't he formulate?
couldn't we formulate?
couldn't you formulate?
couldn't they formulate? 	couldn't I be formulating?
couldn't you be formulating?
couldn't he be formulating?
couldn't we be formulating?
couldn't you be formulating?
couldn't they be formulating? 	couldn't I have formulated?
couldn't you have formulated?
couldn't he have formulated?
couldn't we have formulated?
couldn't you have formulated?
couldn't they have formulated? 	couldn't I have been formulating?
couldn't you have been formulating?
couldn't he have been formulating?
couldn't we have been formulating?
couldn't you have been formulating?
couldn't they have been formulating?