| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [adv] to | 5278 |
|
| 2 | [adv] happen to | 394 |
|
| 3 | [vb past] happen to | 336 |
|
| 4 | [vb past] [adv] happen | 207 |
|
