must thunder
Verbo regular: thunder - thundered- thundered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
it must thunder
-
-
- 	-
-
it must be thundering
-
-
- 	-
-
it must have thundered
-
-
- 	-
-
it must have been thundering
-
-
- 	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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 simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
must it thunder?
-
-
- 	-
-
must it be thundering?
-
-
- 	-
-
must it have thundered?
-
-
- 	-
-
must it have been thundering?
-
-
- 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
mustn't it thunder?
-
-
- 	-
-
mustn't it be thundering?
-
-
- 	-
-
mustn't it have thundered?
-
-
- 	-
-
mustn't it have been thundering?
-
-
-