| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who happen to | 111 |
|
| 2 | [Wh pn] happened to | 59 |
|
| 3 | [Wh pn] happens to | 33 |
|
| 4 | [Wh pn] happen to | 26 |
|
| 5 | whoever happen to | 5 |
|
