| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happened [prep] | 1416 |
|
| 2 | [Wh det] happened [prep] | 1416 |
|
| 3 | [Wh det] [verb] at | 1119 |
|
| 4 | [Wh det] [vb past] at | 479 |
|
| 5 | [Wh det] happen at | 143 |
|
| 6 | [pron] happened at | 119 |
|
| 7 | [Wh det] happened at | 83 |
|
