shall happen
Regular verb: happen - happened- happened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
-
-
it'll happen
-
-
- 	-
-
it'll be happening
-
-
- 	-
-
it'll have happened
-
-
- 	-
-
it'll have been happening
-
-
- 	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
-
-
it shan't happen
-
-
- 	-
-
it shan't be happening
-
-
- 	-
-
it shan't have happened
-
-
- 	-
-
it shan't have been happening
-
-
- 	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
-
-
shall it happen?
-
-
- 	-
-
shall it be happening?
-
-
- 	-
-
shall it have happened?
-
-
- 	-
-
shall it have been happening?
-
-
- 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
-
-
shan't it happen?
-
-
- 	-
-
shan't it be happening?
-
-
- 	-
-
shan't it have happened?
-
-
- 	-
-
shan't it have been happening?
-
-
-