| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] be [Wh det] happened to | 27 |
|
| 2 | [det] be [pron] happened to | 27 |
|
| 3 | [det] be what happened to | 27 |
|
| 4 | [det] be what happened to | 27 |
|
| 5 | that be [pron] happened to | 20 |
|
| 6 | [det] 's [pron] happened to | 18 |
|
| 7 | this be [pron] happened to | 7 |
|
| 8 | [det] is [pron] happened to | 7 |
|
