| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] [adj] [noun] | 2217 |
|
| 2 | [vb past] happen [adj] [noun] | 41 |
|
| 3 | it happen [adj] [noun] | 36 |
|
| 4 | it [vb past] happen [adj] | 13 |
|
