| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [pron] [adv] | 35516 |
|
| 2 | [pron] [adv] happen | 954 |
|
| 3 | [vb past] [adv] happen | 476 |
|
| 4 | [vb past] [pron] happen | 230 |
|
