| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have happened [adj] [noun] ago | 9 |
|
| 2 | [verb] happened [adj] years ago | 6 |
|
| 3 | [vb past] happened [adj] [noun] ago | 6 |
|
| 4 | [verb] happened [adj] year ago | 6 |
|
| 5 | [verb] happened [adj] [noun pl] ago | 6 |
|
| 6 | had happened [adj] [noun] ago | 6 |
|
| 7 | [verb] happened [num] [noun] ago | 5 |
|
