| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] happen [be] [prep] | 7 |
|
| 2 | [vb mod] happen be [prep] | 7 |
|
| 3 | [vb mod] happen [is] [prep] | 5 |
|
| 4 | [vb mod] happen is [prep] | 5 |
|
