| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] | 203739 |
|
| 2 | it [vb infin] | 7293 |
|
| 3 | it happen | 2273 |
|
| 4 | [pron] happen | 376 |
|
| 5 | [pers pn] happen | 340 |
|
| 6 | it happen | 293 |
|
