Conjugación del verbo inglés
COULD RAIN

Verbo regular: rain - rained - rained

Afirmación

Forma simple	Forma con V-ing
- - it could rain - - -	- - it could be raining - - -
Perfecto	Perfecto con V-ing
- - it could have rained - - -	- - it could have been raining - - -

Negación

Forma simple	Forma con V-ing
- - it couldn't rain - - -	- - it couldn't be raining - - -
Perfecto	Perfecto con V-ing
- - it couldn't have rained - - -	- - it couldn't have been raining - - -

Forma interrogativa

Forma simple	Forma con V-ing
- - could it rain? - - -	- - could it be raining? - - -
Perfecto	Perfecto con V-ing
- - could it have rained? - - -	- - could it have been raining? - - -

Forma interro-negativa

Forma simple	Forma con V-ing
- - couldn't it rain? - - -	- - couldn't it be raining? - - -
Perfecto	Perfecto con V-ing
- - couldn't it have rained? - - -	- - couldn't it have been raining? - - -