| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [verb] | 38336 |
|
| 2 | what [vb past] | 12771 |
|
| 3 | what happen | 5181 |
|
| 4 | [pron] happened | 5017 |
|
| 5 | [Wh det] happened | 3294 |
|
| 6 | what happened | 3012 |
|
