| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] happen to | 506 |
|
| 2 | happen to [art] | 137 |
|
| 3 | [vb mod] to [art] | 85 |
|
| 4 | [vb mod] happen [art] | 13 |
|
