| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | i [vb base] [adv] | 73041 |
|
| 2 | [vb base] [adv] happen | 92 |
|
| 3 | i [adv] happen | 40 |
|
| 4 | i [vb base] happen | 17 |
|
