| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [verb] happened is this | 5 |
|
| 2 | what [verb] happened is this | 5 |
|
| 3 | [pron] [verb] happened is this | 5 |
|
| 4 | [Wh det] [verb] happened is this | 5 |
|
