Conjugación del verbo inglés
COULD SNOW

Verbo regular: snow - snowed - snowed

Afirmación

Forma simple	Forma con V-ing
- - it could snow - - -	- - it could be snowing - - -
Perfecto	Perfecto con V-ing
- - it could have snowed - - -	- - it could have been snowing - - -

Negación

Forma simple	Forma con V-ing
- - it couldn't snow - - -	- - it couldn't be snowing - - -
Perfecto	Perfecto con V-ing
- - it couldn't have snowed - - -	- - it couldn't have been snowing - - -

Forma interrogativa

Forma simple	Forma con V-ing
- - could it snow? - - -	- - could it be snowing? - - -
Perfecto	Perfecto con V-ing
- - could it have snowed? - - -	- - could it have been snowing? - - -

Forma interro-negativa

Forma simple	Forma con V-ing
- - couldn't it snow? - - -	- - couldn't it be snowing? - - -
Perfecto	Perfecto con V-ing
- - couldn't it have snowed? - - -	- - couldn't it have been snowing? - - -