| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | about what happened [prep] | 50 |
|
| 2 | about [Wh det] happened [prep] | 50 |
|
| 3 | about [Wh det] happened to | 24 |
|
| 4 | about [Wh det] happened to | 24 |
|
| 5 | about [Wh det] happened in | 10 |
|
| 6 | about [Wh det] happened in | 10 |
|
| 7 | about [Wh det] happened at | 8 |
|
| 8 | about [Wh det] happened at | 8 |
|
