| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [verb] [prep] | 5791 |
|
| 2 | what [vb past] [prep] | 2590 |
|
| 3 | what happen [prep] | 2048 |
|
| 4 | [pron] happened [prep] | 1950 |
|
| 5 | [Wh det] happened [prep] | 1416 |
|
| 6 | what happened [prep] | 1257 |
|
