| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [adv] happened to | 25 |
|
| 2 | what [adv] happened to | 18 |
|
| 3 | which [adv] happened to | 7 |
|
| 4 | [Wh det] ever happened to | 5 |
|
| 5 | [Wh det] really happened to | 5 |
|
