could rain
Verbo regular: rain - rained- rained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
it could rain
-
-
- 	-
-
it could be raining
-
-
- 	-
-
it could have rained
-
-
- 	-
-
it could have been raining
-
-
- 	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
it couldn't rain
-
-
- 	-
-
it couldn't be raining
-
-
- 	-
-
it couldn't have rained
-
-
- 	-
-
it couldn't have been raining
-
-
- 	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
could it rain?
-
-
- 	-
-
could it be raining?
-
-
- 	-
-
could it have rained?
-
-
- 	-
-
could it have been raining?
-
-
- 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
-
-
couldn't it rain?
-
-
- 	-
-
couldn't it be raining?
-
-
- 	-
-
couldn't it have rained?
-
-
- 	-
-
couldn't it have been raining?
-
-
-