| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] [prep] | 31446 |
|
| 2 | it [vb past] [prep] | 11869 |
|
| 3 | [pron] happened [prep] | 1950 |
|
| 4 | it happen [prep] | 472 |
|
| 5 | [pers pn] happened [prep] | 363 |
|
| 6 | it happened [prep] | 221 |
|
