| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | happens is | 162 |
|
| 2 | happened is | 83 |
|
| 3 | happening is | 68 |
|
| 4 | happen is | 62 |
|
| 5 | to happen is | 47 |
|
| 6 | happened is | 46 |
|
| 7 | happen is | 9 |
|
