| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [adv] [prep] | 35405 |
|
| 2 | [adv] happen [prep] | 836 |
|
| 3 | [vb past] happen [prep] | 654 |
|
| 4 | [vb past] [adv] happen | 207 |
|
