| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] what happened to | 42 |
|
| 2 | so what happened to | 17 |
|
| 3 | so what happened to | 17 |
|
| 4 | [adv prt] what happened to | 12 |
|
| 5 | exactly what happened to | 11 |
|
| 6 | exactly what happened to | 11 |
|
| 7 | out what happened to | 10 |
|
| 8 | out what happened to | 10 |
|
