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 must not thunder
-
-
- 	-
-
it must not be thundering
-
-
- 	-
-
it must not have thundered
-
-
- 	-
-
it must not 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 	
-
-
must it not thunder?
-
-
- 	-
-
must it not be thundering?
-
-
- 	-
-
must it not have thundered?
-
-
- 	-
-
must it not have been thundering?
-
-
-