| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to happen be | 57 |
|
| 2 | to happen [is] | 48 |
|
| 3 | to happen is | 47 |
|
| 4 | to happen [was/were] | 8 |
|
| 5 | to happen was | 7 |
|
