| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] what happened to | 42 |
|
| 2 | so what happened [prep] | 25 |
|
| 3 | exactly what happened [prep] | 23 |
|
| 4 | [adv] what happened in | 13 |
|
| 5 | precisely what happened [prep] | 8 |
|
| 6 | [adv] what happened on | 7 |
|
