must rain
Verbo regular: rain - rained- rained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
-
-
it must rain
-
-
- 	-
-
it must be raining
-
-
- 	-
-
it must have rained
-
-
- 	-
-
it must have been raining
-
-
- 	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
-
-
it must not rain
-
-
- 	-
-
it must not be raining
-
-
- 	-
-
it must not have rained
-
-
- 	-
-
it must not have been raining
-
-
- 	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
-
-
must it rain?
-
-
- 	-
-
must it be raining?
-
-
- 	-
-
must it have rained?
-
-
- 	-
-
must it have been raining?
-
-
- 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
-
-
must it not rain?
-
-
- 	-
-
must it not be raining?
-
-
- 	-
-
must it not have rained?
-
-
- 	-
-
must it not have been raining?
-
-
-