| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it had happened [adj] [noun] | 6 |
|
| 2 | it had happen [adj] [noun pl] | 5 |
|
| 3 | it had happen [det] [noun] | 5 |
|
| 4 | it had happen [adj] time | 5 |
|
