| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] [pron] [adv] [adv] happen | 7 |
|
| 2 | [subord] it [adv] [adv] happen | 6 |
|
| 3 | [subord] [pers pn] [adv] [adv] happen | 6 |
|
| 4 | [subord] it [adv] [adv] happen | 6 |
|
