| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | happened to | 1610 |
|
| 2 | happened to | 995 |
|
| 3 | happens to | 954 |
|
| 4 | happen to | 718 |
|
| 5 | happening to | 461 |
|
| 6 | happen to | 319 |
|
| 7 | to happen to | 206 |
|
