| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which happen [prep] be a | 6 |
|
| 2 | which happen to [be] a | 6 |
|
| 3 | which happen to [be] a | 6 |
|
| 4 | which happen [prep] be a | 6 |
|
| 5 | which happen [prep] [be] a | 6 |
|
| 6 | which happen [prep] [be] a | 6 |
|
