| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [adv] happen that | 126 |
|
| 2 | it [adv] happen that | 125 |
|
| 3 | it often [verb] that | 34 |
|
| 4 | it often happen that | 24 |
|
| 5 | [pron] often happen that | 24 |
|
| 6 | it often happen [conj] | 24 |
|
