| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [adv] [verb] [be] | 182 |
|
| 2 | [Wh det] [adv] [vb past] [be] | 74 |
|
| 3 | [Wh det] [adv] happen [be] | 48 |
|
| 4 | [pron] [adv] happened [be] | 26 |
|
