| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb mod] [verb] to | 789 |
|
| 2 | [pron] [vb mod] happen to | 375 |
|
| 3 | which [vb mod] happen [prep] | 20 |
|
| 4 | which [vb mod] happen [prep] | 20 |
|
| 5 | which [vb mod] happen to | 10 |
|
| 6 | which [modal v] happen to | 10 |
|
