| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [adv] happened [prep] [noun] | 12 |
|
| 2 | [Wh det] [adv] happened [prep] [noun prp] | 10 |
|
| 3 | [Wh det] [adv] happened in [noun] | 7 |
|
| 4 | [Wh det] [adv] happened to [noun] | 5 |
|
