| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [adv] [pron] [vb past] happen | 7 |
|
| 2 | [pron] [adv] what [verb] happen | 6 |
|
| 3 | [pron] [adv] [Wh det] [vb past] happen | 5 |
|
| 4 | [pron] [adv] what [vb past] [verb] | 5 |
|
| 5 | [pron] [adv] what [vb past] happen | 5 |
|
