| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which happen to be | 52 |
|
| 2 | which happen to [be] | 52 |
|
| 3 | which happens to [be] | 22 |
|
| 4 | which happened to [be] | 17 |
|
| 5 | which happen to [be] | 13 |
|
