| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [verb] to | 4804 |
|
| 2 | which [vb past] to | 1885 |
|
| 3 | [pron] happened to | 1195 |
|
| 4 | which happened [prep] | 64 |
|
| 5 | which happen to | 64 |
|
