| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [Wh det] happened to | 28 |
|
| 2 | [is] what happened to | 28 |
|
| 3 | [is] what happened to | 28 |
|
| 4 | [is] [pron] happened to | 28 |
|
| 5 | 's [pron] happened to | 19 |
|
| 6 | is [pron] happened to | 9 |
|
