Regular verb: happen - happened - happened
Simple form | V-ing form |
- - it ought to happen - - - | - - it ought to be happening - - - |
Perfect | V-ing perfect |
- - it ought to have happened - - - | - - it ought to have been happening - - - |
Simple form | V-ing form |
- - it ought not to happen - - - | - - it ought not to happening - - - |
Perfect | V-ing perfect |
- - it ought not to have happened - - - | - - it ought not to have been happening - - - |
Simple form | V-ing form |
- - ought to it happen? - - - | - - ought to it be happening? - - - |
Perfect | V-ing perfect |
- - ought to it have happened? - - - | - - ought to it have been happening? - - - |
Simple form | V-ing form |
- - ought it not to happen? - - - | - - ought it not to be happening? - - - |
Perfect | V-ing perfect |
- - ought it not to have happened? - - - | - - ought it not to have been happening? - - - |