| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] happened to [be] | 74 |
|
| 2 | [Wh det] [adv] happened [be] | 26 |
|
| 3 | [Wh det] [adv] happened to | 25 |
|
| 4 | [Wh det] happened to [be] | 18 |
|
