| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [verb] to [be] | 1421 |
|
| 2 | which [vb past] to [be] | 476 |
|
| 3 | [pron] happened to [be] | 236 |
|
| 4 | which happen to [be] | 52 |
|
| 5 | which happened [prep] [be] | 17 |
|
