could achieve
Verbo regular: achieve - achieved- achieved

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could achieve
you could achieve
he could achieve
we could achieve
you could achieve
they could achieve 	I could be achieving
you could be achieving
he could be achieving
we could be achieving
you could be achieving
they could be achieving	I could have achieved
you could have achieved
he could have achieved
we could have achieved
you could have achieved
they could have achieved	I could have been achieving
you could have been achieving
he could have been achieving
we could have been achieving
you could have been achieving
they could have been achieving	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't achieve
you couldn't achieve
he couldn't achieve
we couldn't achieve
you couldn't achieve
they couldn't achieve 	I couldn't be achieving
you couldn't be achieving
he couldn't be achieving
we couldn't be achieving
you couldn't be achieving
they couldn't be achieving	I couldn't have achieved
you couldn't have achieved
he couldn't have achieved
we couldn't have achieved
you couldn't have achieved
they couldn't have achieved	I couldn't have been achieving
you couldn't have been achieving
he couldn't have been achieving
we couldn't have been achieving
you couldn't have been achieving
they couldn't have been achieving	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I achieve?
could you achieve?
could he achieve?
could we achieve?
could you achieve?
could they achieve? 	could I be achieving?
could you be achieving?
could he be achieving?
could we be achieving?
could you be achieving?
could they be achieving? 	could I have achieved?
could you have achieved?
could he have achieved?
could we have achieved?
could you have achieved?
could they have achieved? 	could I have been achieving?
could you have been achieving?
could he have been achieving?
could we have been achieving?
could you have been achieving?
could they have been achieving? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I achieve?
couldn't you achieve?
couldn't he achieve?
couldn't we achieve?
couldn't you achieve?
couldn't they achieve? 	couldn't I be achieving?
couldn't you be achieving?
couldn't he be achieving?
couldn't we be achieving?
couldn't you be achieving?
couldn't they be achieving? 	couldn't I have achieved?
couldn't you have achieved?
couldn't he have achieved?
couldn't we have achieved?
couldn't you have achieved?
couldn't they have achieved? 	couldn't I have been achieving?
couldn't you have been achieving?
couldn't he have been achieving?
couldn't we have been achieving?
couldn't you have been achieving?
couldn't they have been achieving?