| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [modal v] [adv] happen | 173 |
|
| 2 | [pron] [modal v] happen in | 107 |
|
| 3 | [pron] [adv] happen in | 54 |
|
| 4 | [pron] [modal v] [adv] in | 44 |
|
| 5 | [modal v] [adv] happen in | 23 |
|
