| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [adv] to | 5278 |
|
| 2 | [vb past] happened to | 316 |
|
| 3 | [vb past] [adv] happened | 198 |
|
| 4 | [adv] happened to | 74 |
|
