| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] have happened at [art] [noun] | 14 |
|
| 2 | what have happened at [art] [noun] | 12 |
|
| 3 | [Wh det] have happened at [art] [noun] | 12 |
|
| 4 | what have happened at [art] [noun] | 12 |
|
| 5 | have happened at [art] [adj] [noun] | 11 |
|
| 6 | have happened at [art] [noun] [prep] | 6 |
|
| 7 | have happened at [art] [noun] [prep] | 6 |
|
