| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] [Wh det] happened to | 10 |
|
| 2 | be [adv] what happened to | 10 |
|
| 3 | be exactly [Wh det] happened to | 6 |
|
| 4 | 's [adv] [Wh det] happened to | 5 |
|
