| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [verb] [prep] be | 1446 |
|
| 2 | which [vb past] [prep] be | 490 |
|
| 3 | [pron] happened [prep] be | 236 |
|
| 4 | which happen [prep] be | 52 |
|
| 5 | which happened [prep] [be] | 17 |
|
