| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [adv] happen that | 18 |
|
| 2 | it [vb mod] [adv] happen that | 18 |
|
| 3 | it can [adv] happen that | 5 |
|
| 4 | it may [adv] happen that | 5 |
|
