| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [Wh det] happened to | 33 |
|
| 2 | be what happened to | 33 |
|
| 3 | be what happened to | 33 |
|
| 4 | 's [pron] happened to | 19 |
|
| 5 | is [pron] happened to | 9 |
|
| 6 | was [pron] happened to | 5 |
|
