| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] happen | 318 |
|
| 2 | [adv] happen in | 239 |
|
| 3 | [modal v] happen in | 198 |
|
| 4 | [modal v] [adv] in | 88 |
|
