Coniugazione del verbo inglese
COULD THUNDER

Verbo regolare: thunder - thundered - thundered

Affermazione

Forma semplice	Forma con V-ing
- - it could thunder - - -	- - it could be thundering - - -
Perfetto	Perfetto con V-ing
- - it could have thundered - - -	- - it could have been thundering - - -

Negazione

Forma semplice	Forma con V-ing
- - it could not thunder - - -	- - it could not be thundering - - -
Perfetto	Perfetto con V-ing
- - it could not have thundered - - -	- - it could not have been thundering - - -

Forma interrogativa

Forma semplice	Forma con V-ing
- - could it thunder? - - -	- - could it be thundering? - - -
Perfetto	Perfetto con V-ing
- - could it have thundered? - - -	- - could it have been thundering? - - -

Forma interro-negativa

Forma semplice	Forma con V-ing
- - could it not thunder? - - -	- - could it not be thundering? - - -
Perfetto	Perfetto con V-ing
- - could it not have thundered? - - -	- - could it not have been thundering? - - -