ought to happen
Verbo regular: happen - happened- happened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
-
-
it ought to happen
-
-
- 	-
-
it ought to be happening
-
-
- 	-
-
it ought to have happened
-
-
- 	-
-
it ought to have been happening
-
-
- 	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
-
-
it oughtn't to happen
-
-
- 	-
-
it oughtn't to be happening
-
-
- 	-
-
it oughtn't to have happened
-
-
- 	-
-
it oughtn't to have been happening
-
-
- 	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
-
-
ought to it happen?
-
-
- 	-
-
ought to it be happening?
-
-
- 	-
-
ought to it have happened?
-
-
- 	-
-
ought to it have been happening?
-
-
- 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
-
-
oughtn't it to happen?
-
-
- 	-
-
oughtn't it to be happening?
-
-
- 	-
-
oughtn't it to have happened?
-
-
- 	-
-
oughtn't it to have been happening?
-
-
-