| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | happened to [be] [verb] | 121 |
|
| 2 | [verb] to [be] pass | 63 |
|
| 3 | [vb past] to [be] pass | 27 |
|
| 4 | happen to [be] pass | 20 |
|
| 5 | happened [prep] [be] pass | 17 |
|
