| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [adv] [verb] | 1542 |
|
| 2 | what [adv] [vb past] | 635 |
|
| 3 | [pron] [adv] happened | 476 |
|
| 4 | what [adv] happen | 281 |
|
