| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | happen for | 41 |
|
| 2 | happened for | 25 |
|
| 3 | happening for | 19 |
|
| 4 | happens for | 17 |
|
| 5 | to happen for | 13 |
|
| 6 | happened for | 10 |
|
| 7 | happen for | 5 |
|
