| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have happened a [adj] [noun] | 13 |
|
| 2 | happened a [adj] [noun] ago | 9 |
|
| 3 | have happened [adj] [noun] ago | 9 |
|
| 4 | have a [adj] [noun] ago | 7 |
|
