must thunder
Verbo regolare: thunder - thundered- thundered

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

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
-
-
it mustn't thunder
-
-
- 	-
-
it mustn't be thundering
-
-
- 	-
-
it mustn't have thundered
-
-
- 	-
-
it mustn't have been thundering
-
-
- 	

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

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
-
-
mustn't it thunder?
-
-
- 	-
-
mustn't it be thundering?
-
-
- 	-
-
mustn't it have thundered?
-
-
- 	-
-
mustn't it have been thundering?
-
-
-