could structure
Verbo regular: structure - structured- structured

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could structure
you could structure
he could structure
we could structure
you could structure
they could structure 	I could be structuring
you could be structuring
he could be structuring
we could be structuring
you could be structuring
they could be structuring	I could have structured
you could have structured
he could have structured
we could have structured
you could have structured
they could have structured	I could have been structuring
you could have been structuring
he could have been structuring
we could have been structuring
you could have been structuring
they could have been structuring	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't structure
you couldn't structure
he couldn't structure
we couldn't structure
you couldn't structure
they couldn't structure 	I couldn't be structuring
you couldn't be structuring
he couldn't be structuring
we couldn't be structuring
you couldn't be structuring
they couldn't be structuring	I couldn't have structured
you couldn't have structured
he couldn't have structured
we couldn't have structured
you couldn't have structured
they couldn't have structured	I couldn't have been structuring
you couldn't have been structuring
he couldn't have been structuring
we couldn't have been structuring
you couldn't have been structuring
they couldn't have been structuring	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I structure?
could you structure?
could he structure?
could we structure?
could you structure?
could they structure? 	could I be structuring?
could you be structuring?
could he be structuring?
could we be structuring?
could you be structuring?
could they be structuring? 	could I have structured?
could you have structured?
could he have structured?
could we have structured?
could you have structured?
could they have structured? 	could I have been structuring?
could you have been structuring?
could he have been structuring?
could we have been structuring?
could you have been structuring?
could they have been structuring? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I structure?
couldn't you structure?
couldn't he structure?
couldn't we structure?
couldn't you structure?
couldn't they structure? 	couldn't I be structuring?
couldn't you be structuring?
couldn't he be structuring?
couldn't we be structuring?
couldn't you be structuring?
couldn't they be structuring? 	couldn't I have structured?
couldn't you have structured?
couldn't he have structured?
couldn't we have structured?
couldn't you have structured?
couldn't they have structured? 	couldn't I have been structuring?
couldn't you have been structuring?
couldn't he have been structuring?
couldn't we have been structuring?
couldn't you have been structuring?
couldn't they have been structuring?