| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who happen [prep] be | 111 |
|
| 2 | who happen to be | 111 |
|
| 3 | who happen [prep] be | 111 |
|
| 4 | who happened [prep] be | 56 |
|
| 5 | who happens [prep] be | 30 |
|
| 6 | who happen [prep] be | 25 |
|
