| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] happen [prep] | 435 |
|
| 2 | [prep] [pron] happen [prep] | 435 |
|
| 3 | about [pron] [verb] [prep] | 285 |
|
| 4 | about [pron] happen [prep] | 76 |
|
