| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [pron] have happened to | 29 |
|
| 2 | [adv] what have happened to | 26 |
|
| 3 | [adv] what have happened to | 26 |
|
| 4 | [adv] [Wh det] have happened to | 26 |
|
| 5 | [adv] [adj] have happened to | 9 |
|
| 6 | [adv] [det] have happened to | 5 |
|
