| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] have happened at the | 17 |
|
| 2 | what have happened at the | 15 |
|
| 3 | what have happened at the | 15 |
|
| 4 | [Wh det] have happened at the | 15 |
|
| 5 | have happened at the [noun] | 18 |
|
| 6 | have happened at the [noun sg] | 16 |
|
| 7 | have happened at the [adj] | 7 |
|
