must snow
Verbo regular: snow - snowed- snowed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
it must snow
-
-
- 	-
-
it must be snowing
-
-
- 	-
-
it must have snowed
-
-
- 	-
-
it must have been snowing
-
-
- 	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
it must not snow
-
-
- 	-
-
it must not be snowing
-
-
- 	-
-
it must not have snowed
-
-
- 	-
-
it must not have been snowing
-
-
- 	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
must it snow?
-
-
- 	-
-
must it be snowing?
-
-
- 	-
-
must it have snowed?
-
-
- 	-
-
must it have been snowing?
-
-
- 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
must it not snow?
-
-
- 	-
-
must it not be snowing?
-
-
- 	-
-
must it not have snowed?
-
-
- 	-
-
must it not have been snowing?
-
-
-