| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adv] what happened to | 9 |
|
| 2 | [is] [adv] [Wh det] happened to | 9 |
|
| 3 | 's [adv] [Wh det] happened to | 5 |
|
| 4 | [is] exactly [Wh det] happened to | 5 |
|
